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.
4 balls for sale – The first ball is almost like an egg: someone sat on it in a puddle, the shape is non-standard, but cool 700 rsd The second is also an egg, but different: less damaged, you can play! 800 rsd The third is deflated, there are a few scratches 600 The fourth is a little deflated, there are scratches 750 rsd