Either you have an honest buyer who is not satisfied with his purchase or you have a scammer.
The first is the easiest to deal with.
Tell him to return the toy for a refund "I regret you are not happy with your purchase. Please return it for a prompt refund."
No return-- no refund.
If he returns it refund his entire payment-- and relist the item.
If he demands return shipping, tell him to open an eBay Dispute, to keep the record straight. You don't have to tell him how to do that.
EBay will either tell you to send him return shipping or will give him a label and charge you for it.
If he uses it to return the car, refund his entire payment-- and relist the item.
If he doesn't, he loses the Dispute and you keep the payment. The cost of the unused return shipping label will eventually be returned to you.
If he is dishonest he will not want to return the car. Let him scream and yell. He has to open that eBay Dispute and go on record.*
No return, no refund.
All of which can be done through the Resolution Centre, with no human being involved.
Worst case, is the guy who returns something other than what you sent. That's a matter for Customer Service. Which can be erratic.
*Note that a buyer with a track record of "too many" Disputes and Claims loses the use of the Money Back Guarantee.
