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then next round you get max ammo.

I've tried this a bunch of times and it works.

i was playing yesterday and after we got the last toy for the fly trap witch i shot the teddy with the upgraded colt with mine upgraded when someone opened the box it said max ammo but we didn't get any ammo and he opened the box at least 10 times and it said it every time

Its the repeated audio glitch. It happens randomly(maybe lag) and it switches the audio with something else. Which is why when you open the box it got confused and played the max ammo audio every time.

Edit: 250th post

You probably did it 2 times. And if this was 100% then Trey would fix it. Sorry, but sir, you fail.

It's totally random. Fail!