Tell me about it. I had an old, large, blue Persian that did the same trick. At the time I had 5 other cats and 3 dogs. The Persian would hold meat parties whilst I was at work. Between them they devoured the remnants of cooked joints - pork, beef, gammon - in a single week. I came home one day and the Persian ran past me in the hall. I had a subliminal image of something in its mouth so went after it to find the image was a packet of uncooked sausages. I went up to the shops and got a child-proof fridge lock, which was effective. Until I wanted to open the fridge door and nearly pulled my nails off. It only took about a month to get used to the damn thing.
After one of the fridge raids I noticed a few days later that the Persian had what I can only describe as a tampon string hanging out of its bottom. The joint of silverside had the butcher's string around it, well it would. After I had stopped crying with laughter I tried to remove the piece of string carefully - the cat went cross-eyed. I tried again, with just slightly more determination and the cat wailed. I gave up and told him that he had 24 hrs to sort himself out or he was going to the vets!
All things come to pass ...