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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.
Virtually all professionals use your field of reference. This is the most essential fact of all. Was that dandy or what? I'm going to attach a YouTube video clip at the end of this story that shows the approach. They couldn't do that to save their life.