I just received a text from the Seller saying the Cashier's Check has been deposited (same bank, so it's already "cleared"!), and he's sending me the Title overnight.
Just a FYI. You could have gone to your local branch of the same bank, and made a cash deposit into his account. No chance of the check getting misdirected. I have done this. Actually the depositor does not even need to have an account at the bank.