I'm from the US and I've never heard of a bank verifying permission before releasing funds, they simply release the funds. As far as I know, US banks no longer check the signature (if they ever did) and no longer validate the date on the check (at least at my bank you can no longer post-date a check).

We recently lost a book of checks and the bank totally wigged out. They demanded that we close the account immediately and it took a decent amount of back and forth to talk them into waiting a week (we wanted existing checks to clear). To my mind, this implied that they did no validation on checks.