I ordered a case on Ozon, the friend who brought it to me didn't notice that it came in the wrong size( I reordered it later, because the case is cool, and this one is just lying around
Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.