that's what I did, and I kept a copy of the shipping label, but that strip doesn't prove that you gave it to purolator. If you drop it at staples to go out too they give nothing. It's possible that a customer could say they dropped it off, keep that strip, but never gave it to anyone, and kept it, which I'm sure is what they would say if the box never made it to the sorting plant and got scanned in... It is possible for it to get lost, and I would have no proof that it was sent, if it didn't get scanned....