What should I do with my check after I receive confirmation that the image has been received for deposit?

Store checks in a secure place for 30 days after your deposit and then destroy

Once funds have been made available in your account, write "ELECTRONICALLY DEPOSITED on date" across the front of the check to avoid the risk of re-depositing. The date should be the month, day, and year you submitted the deposit. Store in a secure place for 30 days after your deposit and then destroy.