After sleeping on it, I finally figured it out. It's NOT from OWS, but when you hear what it IS from, you'll understand why it took me so long to figure it out and why I was confused. It's from a swap in January
that my partner flaked on. She kept promising to send for months now, but I hadn't heard she finally sent. What's funny is there was a delivery conformation form on it but since I never knew it was sent, it didn't do anyone any good. But that's why the name sounded vaguely familiar. I had mailed to her
two months ago!
Mystery solved! Surprising to receive, but now I need to go pm some people and let them know it actually did show up. At least I'm not anywhere near as confused about who's claimed me as I thought!