I've been collecting these for awhile now, and I'm wondering if anyone has figured out the rhyme or reason to their spawn timers. Aside from always looking in all 7 boxes, I've never found more than one at a time. Also, some days I don't find any... I don't recall the devs ever disclosing any details on the spawn rate, so I'm wondering if anyone else has found multiples in one visit? How about respawn? Anyone know if it's a once per day thing? Any input is appreciated!