I bought the regular edition of Busu ni naranai tetsugaku from dora. This is the envelope in which I received it along with a bunch of photocards:
I swear I didn't open it myself; in fact, I didn't even have to open the envelope to get my stuff. My post office had to put it in a bag with a written apology.
Just warning you guys that dora's envelopes aren't sturdy and damage to your items can happen. It happened to me twice in a row.