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 educational materials: 1. Book about Egypt, missing four stickers at the end - 600 din. 2. Book with tasks, unusual disappearance - 200 din. 3. Metal puzzles - 600 din. Pick up, Grbavica