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.
Selling Nike Air Max 97 sneakers. Size EUR 43. Bought in Argentina at the official Nike store. Worn about 10 times. Selling because I didn't quite get the size right and they rub, as my foot is quite wide. Good condition, the air units on the sneakers are intact. Unfortunately, there is no box, as it was not possible to take it with me during the move to Ser...