I love 99 boxes, but that’s only because of the sweet sweet XP glitch for weapons and skills, although it’s pretty easy to unlock all the skills without cheesing.

For those wondering, the exit zone/square thing marks the mission as completed as soon as you step into it, which is probably intended. What’s not intended is that on this heist every time you walk in and out of the square it counts as an additional completion. So if you want to level a gun just do a run of 99 boxes and hop in and out of the exit for a few minutes and then complete it (I usually trigger it 100-150 times to be sure). Gun done.

Honestly it’s the only thing that kept me playing for as long as I did, because trying to level the weapons is almost as bad as the infamy grind. Whoever pushed the progression systems through in this state should feel shame, although I doubt they’re capable of doing so.