How to get back at my sister for stealing my cheesecakes?

So yesterday, I went to Wal-Mart and bought 6 cheesecakes, for a Christmas party I am having 4 days ago. While I am on my computer, my sister duct tapes me to my chair and steals the 6 cheesecakes. She moved out of her house, changed her phone number and email, discontinued her PO box, and quit her job. I saw that she had put them up for sale on eBay, and I am thinking about just buying them back, and having a trap set up when she arrives. What are some good ideas for getting her back?