Private contractors, government units, utility companies all store construction & utility related stuff willy nilly, secure or unsecure, for convenience and sometimes out of neglect, with no culture within them for strict accountability of the material.
Yeah, god forbid you store stuff in some out of the way convenient place without considerng some idiot crackhead lifetime pest and scofflaw is gonna light it on fire. Letting human trash like the accused wander around freely is why we can’t have nice things.