I just won two also. It looks like they have added an incentive to actually try and win again. They did this with the ice - one for reaching level 5 and two if you were the winner.
I got the crate with 57 ghosts and a win but it seems to come with the normal win bonus. For this reason I am inclined to beleive it is for any win and every few games you complete loss on no win I will speculate you might(i stress might) get a blue crate.
Too bad it was not red for Fireworks and Blue for ghosts
It is definitely based purely on a win... I've been stacking up a team of 4 friends against another team and even though the credit payoff is lousy (never have I played and won only a 100 credits ) all of the winners get a crate
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