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 components - Gigabyte GV-N760OC-2GB - 2000 din MSI N730K-2GD3H/LP - 1500 din AMD A6-9500E processor - 2000 din Will deliver to Petrovaradin and Novi Sad