A similar case happened to a user DreamTR awhile ago, and Luckie replied to his thread
I read that thread pretty thoroughly, and I still say that's a BS response.
Quantity doesn't matter, mistakes like this cost business every time they happen, wouldn't you want to minimize them?
And if the argument is "they're small, cut them some slack" I call bullshit.
I hold up my end of the bargain, you do the same.
If you're dealing with other people's money, it is your job to make sure things happen as they should