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Don't know if this has been posted, but I just found this out accidentally, it basically lets you have 3 (or more) guns during any zombies match, however don't abuse it because when you get to about 5 guns you will get kicked, but 3 is a safe enough gun amount. Basically,
This is apparently a new method, it should work but if not correct me otherwise
1. Activate Mystery Box
2. Get a friend who is down to get near the box
3. Start reviving him until you see the X for Weapon (Yea I can't do the square button picture but it works on both

)
4.Quickly stop reviving him and begin reviving him quickly and when you revive him you should have the third gun!
This is EXTREMELY helpful for later rounds, I managed to get Thundergun, Ray Gun, and RK while doing this, all upgraded got me and my friends to round 39!