system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] (Homecoming Spoilers) About Damage Control...

How did Toomes' gang go unnoticed for so long?  They've been stealing from DoDC convoys for 8 years and selling the refurbished tech to criminals.  Does Damage Control not have an accounting system for the tech they've claimed?  They didn't even notice that Spider-Man accidentally got locked inside their vault.
gpt
Well, there have been a few events that would tend to leave large gaps in records keeping. 


Even if DoDC wasn't officially part of S.H.I.E.L.D. some of those events would have disrupted records. 


Past that.. there's always the human factor. X crates loaded, X crates unloaded. Inventory control gets done on Mondays so sometimes things sit through the weekend. Could also be that in the early days DoDC was more careful, but after so many years people get sloppy.