Yes, someone at Valley who found he no longer needed the Mk4 and tried to hand it back to the Squippers. When they refused to take it, he decided to sell it on EBay. No one told him he'd need it for NVGs later in his service. Almost cost him his career.
ISTR the RAFP had (has?) a small team monitoring EBay for just this sort of thing and EBay just handed over the details (the individual had an address in Mona!).
Back to the thread; the Defence Disposals Services Agency/Authority exists for just this type of disposal. See here amongst other places:
Disposal Services Authority
STH