[lozenge]

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.

[sgerenser]

To add more context: the check is usually not completely fake. It has a legit bank routing and account number on it, typically a business that is also being scammed. So the money will likely actually get withdrawn from some random business’s account and only discovered weeks or even months later.

[smeej]

And if you've attempted to withdraw it, they immediately become very suspicious that you knew it was fake and were trying to steal from them.

Good luck convincing them otherwise!