I stopped off at ToyRUs today and found a rack with 8 of these blisters on them.
From my observation, there are only 3 different arrangements of visible erasers (3 unique packs), each with 3 different erasers.
so you can't put a full set together just by picking up blisters and looking through the plastic.
The blisters have 3 unique spots, one for a big box, one for a can and one for a small box.
the 3 blisters are:
Frosted Snakes, Geek Giant, Jelly Bully
Cap'n Crutch, CaveManWich, Boreo
Ditz, De-Mented, Creeps