[2ndround]

The key to Its success, Is dealing with refurbished phones - which can easily be manipulated and justified with the swap.

I doubt it would go unnoticed. Because they for sure check the IMEI or serial number.
When they see it doesn’t match with what they sent out, you got a problem

I meant more in getting the wrong item case accepted by ebay as it is more believable than receiving lets say a box of rocks.
In terms of the seller catching the wrong item, that is more likely.