I'll give it for FREE (kinder or 1 kg of strawberries for the child)
Things for a boy 5 - 6/7 years old, depending on height
Winter down jacket, bathrobe, a bunch of pants and T-shirts, shoes
Zemun
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.