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.
I want to sell my old 2 Nos. each Rs. 2/- & Rs 5/- notes and 1 No. 50 Paisa Coin (1985 made). My WhatsApp number is 7840006780. Make Advance payment and collect it from me ASAP.