Archeological finds

When I got home last night, I had to put some Re-Ment away in the Great Big Box of Re-Ment (which is actually a quite small box). I also decided to toss out the big display boxes some of it had come in and I discovered I had an entire un-opened box of the Re-Ment Fairyland tableware. Not just one blind box, mind, but an entire 10-box set in a sealed display box. It's been there for a few months. Sealed. How does anything survive sealed around here?