I'd still take it out. You have the bill of sale, the paperworl waiting for the DMV to open, receipts from all the work you've done, etc. Worse case is they make you mail in proof of registration before the ticket payment is due, but in Michigan you can even drive a car for three days with no paltes when you purchase it. And technically, since you just received the paperwork, you just purchased it. You have the receipt in a postmarked envelope for proof of what you've been waiting for..