In the movie Office Space, the main character and his colleagues modify a bank mainframe to skim money off transactions into an account they own. After things going south (transactions coming in a lot faster then they predicted) the main character has a change of heart, withdraws the money in some kind of cashiers checks, and returns it in an envelope to his employer. It is subsequently burned in a fire that destroys everything at the company.
Why didn't Peter's account continue to receive money after that initial withdrawal? The software was still modified. Are we to believe that all the software for making the transactions was hosted (and subsequently burned in that building)? At the rate they were receiving funds, it would seem that even from the time he made that withdrawal to the time the building burn, surely there would have been more money made and deposited into that account. If not that, at least there should be some offsite backups... otherwise people could no longer bank and all their funds lost? Seems unlikely.