You could add a conflict to make the story more interesting. For example, maybe the guy who finds a winning lottery ticket finds it on the ground, but then finds out who it really belongs to, and has to make a choice; whether he should keep it or take it to its rightful owner.
Something like that will really spice up the plot.
Really, it depends on the reliability and trust with the vendor. The bussiness world is tough and it is hard to find people you can trust. So when making a deal, that is a big, if not the biggest key factor.
