Please pack the return package correctly in step 1, 2 and 3:
Step 1: pack the boots inside the shoe box.
Step 2: pack the shoe box inside the original package-brown box and seal the package-brown box with a tape.
Step 3: use the return shipping label to cover the original shipping label! the last and the most important is to include the commercial invoice OUTSIDE of the package. You may wish to use either a pouch or tape to have the invoice shown to the customs officer at the border for inspection.
Please see the image attached here.
Remember to contact us if you have any questions about it.