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.
Lego Technic disassembled by packages as in the instructions, if necessary we can assemble, the instructions are available. 3800 din, Telep district, I can bring it to the center