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When a certified cheque is created, the bank will print a receipt. The receipt (and sometimes the cheque as well) will have a cheque certification number. So if you have not just the cheque, but the receipt as well, you can now call the issuing bank and state that you have a certified cheque certification number. If you provided THAT, the bank can give you a yes or no answer if the cheque is good or fake.
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Exactly. Last year I bought an SUV that was coming off a lease. I got a certified cheque as payment, and the bank printed the corresponding receipt.
I "paid" for the truck at the branch - handed the cheque to the seller of the truck at his branch (seller wanted to meet me there, to make sure the money went into his account with no glitches... me, as an honest buyer that is not handing a fake cheque, had no problems meeting at his branch).
So I handed him the certified cheque. I didn't want to give him the receipt because it had other info, like my account number, my balance, and other things.
When he tried to deposit the certified cheque, the teller asked if he had the receipt by any chance. He didn't, but I was there next to him, so I said yes, I have it right here, and handed it to the teller, who verified the certified cheque was real, and in one minute the money was in his account, ready to be used.
He didn't know about the receipt... I did know because the previous time I bought a car the teller had to call (on the phone) the issuing bank (my bank), and it took almost half an hour, because when I got the bank draft I didn't go to the teller, just went to see my friend (who is a mortgage advisor and opened my mortgage), so when the receiving bank called the guy went for lunch, etc. etc.
And I agree with Jock Macdonald comment ---- Deal ONLY in person... for example, even if the guy is real and not a scammer, you can exchange 20 emails /texts back and forth arguing about price but the guy may be wasting your time... a serious buyer is going to come over, ask key questions, look closely at the car, and negotiate based on the condition...