If you take it to the tip put it in an old oil can and then tip it in the waste oil tank,they wont know any difference.
Years ago I used to get silly things stolen from my car at a shoot. I knew who it was so I filled a gallon oil can with a mixture petrol and Tate & Lyle suger and left it by may car. Next time down there a certain party was in an old van rather than his car. I said to him 'Did you see any one take a can from my car?. If they did they are in for an unpleasant shock, it was lased with sugar'. That way I told him I had done it. Never lost anything there again.