I was reading a description from an eBay auction for 2013 ANS11 bonus stickers, and B3 and B4 were from Target exclusive jumbo packs. So it's a possibility B3 and B4 for ANS12 might also be found at Target inside jumbo packs with the Target Exclusive logo on it.
sort of correct, but not really
ans 10 had 6 bonus at retail
1,2 and 5,6 were in similar wrappers, but showed up at Target and Walmart respectively (Excel vs the other distributer)
3,4 were in Target Exclusive wrappers
ans 11 had 6 bonus at retail
1,3,4 showed at Target
2,5,6 showed at Walmart
wrappers did not say exclusive to the store.
I'm guessing they will show, but will not say exclusive