Selling a computer chair from Jusk, condition 4 out of 5, everything works (gas lift is like new), you can wash the seat. I sat on another chair for a year, and this one was gathering dust in the corner.
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.