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.
For sale: new mini-fan for iPhone (Lightning connector). You just plug it into your phone and the breeze blows as if you're on a yacht, not at a bus stop in Novi Sad. Miniature, blows with character. New, hasn't even seen dust)