Syntax:
locked object : code [lock location] [code found from]
Listed in order of encountering the locked object
Reception & Marine HQ
Combat Prep : 584 [Marine HQ] [Bill Tyson's PDA near the location on second visit to Marine HQ]
Locker #001 : 396 [Maintenance] [Kitchen, Adam's PDA] – automatically opened and emptied on return trip if not opened by player
Locker #023 : 531 [Energy Stab. Unit] [Baston's PDA right next to it]
??? Possible missing code for something here around this portion of the game?
Locker #017 : 347 [Infirmary] [Caseon's PDA found right next to it]
Alpha Labs (no backtracking)
Locker #013 : 586 [Alpha Labs Hallway] [Dorweiler's PDA found right next to it]
martianbuddy : 0508 [North Hallway] [Moses' PDA found right next to it]
Alpha Labs Sector 1
Locker #009 : 752 [?] [Berger's PDA in nearby room]
Alpha Labs Sector 2
Locker #038 : 409 [MFS Compressor] [Chin's PDA in Engineering Security Checkpoint]
Locker #039 : 102 [Coolant Control Junction] [Connors' PDA in MFS Compressor]
Alpha Labs Sector 3
Locker #047 : 123 [Hazardous Materials Lift] [Lamia's PDA in Hazardous Waste Disposal]
Locker #048 : 123 [Coolant Monitoring] [Lamia's PDA in Hazardous Waste Disposal]
Locker #049 : 123 [EFR Staging Room 1B] [Lamia's PDA in Hazardous Waste Disposal]
Alpha Labs Sector 4
door : ? [Reactor Junction 1] [???; Unlocked if you free the scientist in the previous room]
Locker #064 : 651 [?] [Nelson's PDA]
Enpro Plant
Locker #063 : 972 [Power Core Access] [Chasar's PDA right next to it]
Plasma Storage : 734 [Maintenance 3] [Hammer's PDA in same large room]
Central Communications Tower
Locker #054 : 246 [Security Office] [Wolfe's PDA in Comm Systems]
Waste Recycling 2
Locker #003 : 483 [Monorail Access] [Sadowayj's PDA in Central Maintenance, Waste Recycling 1, and Johnson's PDA in Main Environment Control]
Monorail
Locker #003 : Open [Recycling Boarding Plat.] [None needed]
Monorail Airlock : 826 [Site 2 Transfer Area] [Ross' PDA in Site 2 Transfer Area]
Locker #054 : 142 [Site 2 Transfer Area] [Hollies' PDA right next to it]
Locker #078 : 364 [Delta Checkpoint Storage] [Cullen's PDA in Monorail Security Checkpoint]
Locker #079 : 364 [Delta Checkpoint Storage] [Cullen's PDA in Monorail Security Checkpoint]
Delta Labs 1
Locker #210 : 298 [Storage Room 21-D] [Price's PDA in Delta Entryway]
Delta Labs 2
Locker #112 : 538 [Records Office] [Cinder's PDA in Delta Ops Administration]
Locker #113 : Open [Records Office] [None needed]
M. Abrams office : 931 [Delta Security Junction] [Abrams' PDA in Kaczynski's room in Alpha Labs 4]
Locker #116 : 972 [Delta Security] [Terminal right next to it]
Locker #114 : 715 [Operations Server Room] [Post-it note on the side of the locker]
Locker #115 : Open [Operations Server Room] [None needed]
Delta Labs 2b
Locker #103 : 259 [Maintenance Corridor] [Erikson's PDA right next to it]
Locker #216 : 624 [Specimen Research Lab] [Michael's dialog just before]
Locker #217 : 624 [Specimen Research Lab] [Michael's dialog just before]
Locker #213 : 371 [Stasis Transfer Control] [Stemmon's PDA in Maintenance Area 4]
Locker #666 : 372 [Analysis Control] [Post-it note next to the locker numpad]
Storage 07 : 725 [Central Processing] [McNeil's PDA in Technical Director's Office nearby]
Martian Buddy : 0508 [Secure Storage] [Moses' PDA found in Alpha Labs]
Level 3 Access : 463 [Central Processing] [McNeil's PDA in Technical Director's Office nearby]
Delta Labs 3
Locker #317 : 841 [Terminal Office Storage] [Cerano's PDA in Lower Terminal Office]
Locker #386 : 836 [T1 Access] [Lee's PDA in Chamber 1 Control]
Locker #387 : 836 [T1 Access] [Lee's PDA in Chamber 1 Control]
Delta Labs 4
Locker #104 : 579 [Delta4 Security] [Downing's PDA in Delta4 Junction 2, also a terminal nearby]
CPU Complex
Locker #452 : 571 [Entrance Checkpoint] [Jackson's PDA in Delta Main Lobby in Delta before entering CPU Complex]
Lab A : 626 [Main Entrance Hall] [Bates' PDA in Security Monitoring, also seen through a security monitor nearby]
Locker #669 : 468 [Lab A Upper Floors] [Haskell's PDA in Lab A ???]
Locker #009 : Open [Lab A Upper Floors] [None needed]
locked object : code [lock location] [code found from]
Listed in order of encountering the locked object
Reception & Marine HQ
Combat Prep : 584 [Marine HQ] [Bill Tyson's PDA near the location on second visit to Marine HQ]
Locker #001 : 396 [Maintenance] [Kitchen, Adam's PDA] – automatically opened and emptied on return trip if not opened by player
Locker #023 : 531 [Energy Stab. Unit] [Baston's PDA right next to it]
??? Possible missing code for something here around this portion of the game?
Locker #017 : 347 [Infirmary] [Caseon's PDA found right next to it]
Alpha Labs (no backtracking)
Locker #013 : 586 [Alpha Labs Hallway] [Dorweiler's PDA found right next to it]
martianbuddy : 0508 [North Hallway] [Moses' PDA found right next to it]
Alpha Labs Sector 1
Locker #009 : 752 [?] [Berger's PDA in nearby room]
Alpha Labs Sector 2
Locker #038 : 409 [MFS Compressor] [Chin's PDA in Engineering Security Checkpoint]
Locker #039 : 102 [Coolant Control Junction] [Connors' PDA in MFS Compressor]
Alpha Labs Sector 3
Locker #047 : 123 [Hazardous Materials Lift] [Lamia's PDA in Hazardous Waste Disposal]
Locker #048 : 123 [Coolant Monitoring] [Lamia's PDA in Hazardous Waste Disposal]
Locker #049 : 123 [EFR Staging Room 1B] [Lamia's PDA in Hazardous Waste Disposal]
Alpha Labs Sector 4
door : ? [Reactor Junction 1] [???; Unlocked if you free the scientist in the previous room]
Locker #064 : 651 [?] [Nelson's PDA]
Enpro Plant
Locker #063 : 972 [Power Core Access] [Chasar's PDA right next to it]
Plasma Storage : 734 [Maintenance 3] [Hammer's PDA in same large room]
Central Communications Tower
Locker #054 : 246 [Security Office] [Wolfe's PDA in Comm Systems]
Waste Recycling 2
Locker #003 : 483 [Monorail Access] [Sadowayj's PDA in Central Maintenance, Waste Recycling 1, and Johnson's PDA in Main Environment Control]
Monorail
Locker #003 : Open [Recycling Boarding Plat.] [None needed]
Monorail Airlock : 826 [Site 2 Transfer Area] [Ross' PDA in Site 2 Transfer Area]
Locker #054 : 142 [Site 2 Transfer Area] [Hollies' PDA right next to it]
Locker #078 : 364 [Delta Checkpoint Storage] [Cullen's PDA in Monorail Security Checkpoint]
Locker #079 : 364 [Delta Checkpoint Storage] [Cullen's PDA in Monorail Security Checkpoint]
Delta Labs 1
Locker #210 : 298 [Storage Room 21-D] [Price's PDA in Delta Entryway]
Delta Labs 2
Locker #112 : 538 [Records Office] [Cinder's PDA in Delta Ops Administration]
Locker #113 : Open [Records Office] [None needed]
M. Abrams office : 931 [Delta Security Junction] [Abrams' PDA in Kaczynski's room in Alpha Labs 4]
Locker #116 : 972 [Delta Security] [Terminal right next to it]
Locker #114 : 715 [Operations Server Room] [Post-it note on the side of the locker]
Locker #115 : Open [Operations Server Room] [None needed]
Delta Labs 2b
Locker #103 : 259 [Maintenance Corridor] [Erikson's PDA right next to it]
Locker #216 : 624 [Specimen Research Lab] [Michael's dialog just before]
Locker #217 : 624 [Specimen Research Lab] [Michael's dialog just before]
Locker #213 : 371 [Stasis Transfer Control] [Stemmon's PDA in Maintenance Area 4]
Locker #666 : 372 [Analysis Control] [Post-it note next to the locker numpad]
Storage 07 : 725 [Central Processing] [McNeil's PDA in Technical Director's Office nearby]
Martian Buddy : 0508 [Secure Storage] [Moses' PDA found in Alpha Labs]
Level 3 Access : 463 [Central Processing] [McNeil's PDA in Technical Director's Office nearby]
Delta Labs 3
Locker #317 : 841 [Terminal Office Storage] [Cerano's PDA in Lower Terminal Office]
Locker #386 : 836 [T1 Access] [Lee's PDA in Chamber 1 Control]
Locker #387 : 836 [T1 Access] [Lee's PDA in Chamber 1 Control]
Delta Labs 4
Locker #104 : 579 [Delta4 Security] [Downing's PDA in Delta4 Junction 2, also a terminal nearby]
CPU Complex
Locker #452 : 571 [Entrance Checkpoint] [Jackson's PDA in Delta Main Lobby in Delta before entering CPU Complex]
Lab A : 626 [Main Entrance Hall] [Bates' PDA in Security Monitoring, also seen through a security monitor nearby]
Locker #669 : 468 [Lab A Upper Floors] [Haskell's PDA in Lab A ???]
Locker #009 : Open [Lab A Upper Floors] [None needed]
The code listing will be completed when I bother to, which likely won't be anytime soon.