Alex wrote a check, pocketed the bill of sale and title, and then they all walked out of the office.
Asking to see the original bill of sale or grading certificate can verify the ring's value, but these documents may not always be available.
You'll hand over the cashiers' check, and the seller will give you the title and possibly a bill of sale.
Be sure that the person selling the vehicle and signing the Bill of Sale is the actual owner of the car.
You will need to have the Bill of Sale signed and notarized, then register the document with the title agency.