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.
New Wi-Fi router Xiaomi Router 4A Gigabit Edition White. Unpacked, but never used. Bought a couple of months ago to use as an additional access point, but it was not needed. There is a receipt, the original box is not preserved.