LIT method explained
* This requires an initial investment but you can refund it later *
1)Get the label
2)Remove the address to their warehouse
3)Get a transparent ink that gets removed automatically in less than 48 hours (You can refund it so no problem)
4)You can either write with the ink their warehouse address or write the bar code with the invisible ink it's up to you
5)Wait until Friday afternoon just before the Post Office is closing and ship it so that it disappears over the weekend
6)The warehouse address will be vanished when the courier will try to deliver and it will mark the package as lost in transit
FTID v3 the label just to make sure if anything goes wrong worst-case it still never makes it to the destination.
If by any chance you want the package to get marked as delivered, don't write their address and write the scan code.
Best website for the ink: https://blueplanetink.com/