My Margaret used to steal any food in a baggie. She sometimes would route out my sandwiches that I put in my purse or tote bag in the foyer, before I left for work. She'd chew the sandwich through the bag.
Hey, at least yours doesn't steal jewelry! Little Miss is a jewel thief par excellence. She stole a lovely pearl necklace and ring my husband bought me--he caught her in the act--but then I noticed the matching bracelet was missing. It took a month to find it--behind a piece of furniture I had to move in order to put the Christmas tree up! I made up a "wanted poster" for her, and have it on the wall by my desk at work. She looks like she's smirking in the photo (it was taken before her burglary career started). It lists her aliases, weight, etc. For such a tiny cat, she sure steals big stuff!