We don't have a street mailbox at the apartment we rent. I have to list my street address on Upwork because that's what is on my ID. I've put our PO Box address as the invoice address. How can I assure that any 1099 forms from Upwork are mailed to the PO Box address and not the street address? There's a risk they may be returned to sender if the regular mail carrier for our street happens to be on vacation. When I try to change the address on the W-9, it brings me to the place on the form to change my street address.