Talk:Where the Cat and Wolf Play.../@comment-62.165.239.121-20180508065226/@comment-108.170.49.166-20181015154400

Trophies are proof the job was done, needed to collect the payment. There are even notices directly referencing this. It's why you can't toss your own trophies until you've collected payment for their contracts. It might actually be meta commentary on how that works in-game. If you still have the trophy it means you haven't been paid.