When I was teaching, I used to hide my chocolate and Pepsi Max in boxes of cables and IT equipment. Staff knew I had a stash, but never thought of looking in there, as they hadn't a clue what the items were for. The other place was a drawer in a filing cabinet, marked "Confidential". When I became ill and had to suddenly retire, the ICT technicians and staff kept finding my stash in various boxes. Needless to say, they never returned it, just scoffed the lot..