[Kevan]

This was eventually going to happen and could potentially happen again in the future so we must try to remove the idiot from the equation i.e. covering the delivery address with a new (wrong) label.

I sent two similar sized boxes to a customer in the USA, both full of 3D printed bodyshells, the customer paid me several hundred pounds so I had to make it difficult to go to the wrong address.
A carriers label is always much smaller than A4 so I printed an A4 sized label with the customers name, address, phone number and email in a large font in bold, stuck one on top and one on the side of the box, both completely covered in sellotape.
...it got there no problem, we should do the same or invite a repeat.