A few tech notes.
. The combination to this locker must be altered on a weekly basis per the requests of O5-████.
Unless the Foundation has added at least 987 new O5s, there's no way one would have a four-digit designation.
SCP-1903 is a 5.2 megabyte computer application stored on a 90mm floppy disk
The maximum storage space on a 3.5" floppy is 1.44 mb.
Upon being inserted into a desktop computer's floppy drive, a program entitled "THINK" will prompt the user to enter his/her name.
Considering that 3.5" floppies were used by everything from Apple IIGS and ZX Spectrums to PCs running Windows XP, I can't imagine how one floppy disk could have software compatible with all those OSes in so little space.
Also, floppy disks never had autoplay - inserting a floppy into an already-running computer does nothing unless you manually navigate to the drive and launch the software.
Other than that, it's really just not that interesting.
Various labels plastered to the top and bottom faces of the object […]
In addition to everything that's already been pointed out, this line also made me laugh. 3.5" floppies had a standard label type that covered about 2 inches of the "top" of the floppy, wrapped over the "back", and extended only half an inch across the "bottom". Any more labeling than that and the floppy would no longer work. Also, "plastered" is a non-clinical term anyways when it comes to labels.