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.
For sale: new NOVATION LAUNCHKEY 37 MK4. Purchased in March 2025, used only a couple of times. 2-year warranty. Receipt available, bought at player. Will transfer the included software if I figure out how.