Your team is small so easy to manage. We are about 700 employees deep, spreading out in 12 buildings so when we have a function like that, them crooks would come out. Like the last one where KFC donated us lunch in boxes. I took mine and an absentee co worker and placed it in the fridge. No name on them which I should have but even those people would swipe them. They don't just grab one box, they grabbed a few to take home for their kids too.
So the words of wisdom displayed is take only one and come back in a few hours to see leftovers and those you may harvest at will.