Earlier quoted context omitted.
When you receive the check, shouldn't you go to the bank and withdraw the cash with that? And bank lets you know that it is a fake check, thus denying the withdrawal. At what stage and why are you required to send your cash to someone else?
No, the bank doesn't know if it's a fake check straight away. They find out weeks later during a reconciliation process with the bank that printed the check.
Good luck convincing them otherwise!