sort of related but i have received other peoples checks because the network's envelope machine must have got them stuck to mine under the fold on the envelope. i just put it back in the mail box because i am nice. i noticed though that their check was for almost the same amount as mine so they must print them out in monetary order. also i have been over paid about $5k from another network because i changed my bank details and they sent the same payment as the did to my old bank + the new payment. They never said anything to me but i am nice and told them about it and they didnt seem to care that much really, just goes to show that they deal with tons of money all the time.