[mothered]

Alternatively (better if the wallet weight less than 100g), you could box the wallet putting in the return box some material that gives the impression belongs to warehouses and sealing the package with different colored tape, giving the impression the package it has been opened by somebody during transit and the inside substitute and stolen.

That is actually what I am planning to do with a wallet.

When you perform your SE, I'd be very Interested to read Its progress.