100th post and a mystery.

I intended to do a poignant post for this one, my 100th, but instead, I have a mystery to solve. Perhaps you can help. I got a package in the mail today from an Internet store. In it was the He-Man and She-Ra Christmas movie on DVD. I am very confused. I didn't order it, Mark didn't order it, and neither of us has heard of this website. There was nothing else...no packing slip, no nothing. So, someone has sent me a gift. I want to thank that person. But I have no idea who I should be thanking! Please help!