If you want a mystery box there is a thread for that - Local Only Trade (
https://www.homebrewtalk.com/forum/threads/local-only-trade-lot.548354/).
The draw with FotD is that you know what you are getting, at least from the base offer perspective. If I want a stout-heavy offer, I usually have that option. If I want a sour-heavy offer, I almost always have that option.
If it were a gamble and the person on the other end doesn't know my style preference, I may get an entire offer of beer that I could not physically drink. The idea is cute, but again there is a thread for that.
If you do this, the mystery boxes should almost completely contain one style of beer (or similar styles) because you still fall into the trap of possibly getting beers you cannot drink or do not want to drink. If you show one stout and ship one stout and a half dozen DIPAs, it would be a sad unboxing day (for me).