If i do remember exactly(25 does give magazine A and B)
What i do remember(they are given in the 20s box, surely not 26 and 20 in my test. Also, its very rare. The max capacity from farm to get is not yet known. Should just farm more and more to see more info.
Lets make the list shorter shall we.... all the armour they give you from doing lockdown from 15-25 along with 1k 1 day deagle 7 days deagle mk nade frag nade viper mask 500 euros 1000 euros... PS: I tested it and I got all the results
I played this game mode for a while now, and recorded about 85% of the rewards you can get from 1-26, I even calculated the chance of getting sertain items with the amount of boxes, I tried to post it, but got a message back that it was already been posted, I tried every box number 50 times at least, there are allot more rewards out there