Do you post outside the us ?
No, for legal reasons.
This seems interesting but I don't get why someone would bid. I mean, you said you will give approximately the price of the bid into the box. So wouldn't I be better off just buying what I want instead of getting whatever you have laying around?
If you don't want a MYSTERY box that might be more valuable to you than my valuation, then don't bid.
does anyone know what's the content?
https://www.merriam-webster.com/dictionary/mysteryIf someone reveals what their mystery box contained, it won't be the same thing that's in a future mystery box.