I can't help but wonder how much of the stuff that was "placed beyond use" actually was.
Majority if not all that was held in storage I believe was. Any found not causes major issues.
No doubt there were weapons which had gone missing over time but then again that is prevalent in even the most secure military bases so would not be unexpected.
Acquiring new weapons or explosives isn't really that hard across Europe or making them up given the technology and know how is out there.