For sale: Zara home wooden chairs. Used for 2.5 years. Condition: excellent, except for small areas on the armrests where the varnish is slightly worn. Reason for sale: bought a new table and the chairs don't fit.
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.