[chesterbeatdeath]

Just a little more SEing and you're ready to go!
Got a friendly neighbor nearby? Are they able to be bribed? $20-$40 to them for accepting a few pieces of mail on your behalf.
Just use their address as the letterhead information.
I've always found that bribing people who have NO WANT to know what's going on, but are just willing to take money and give you an envelope that arrives in the mail, is 100% the best way to get a fake address.

Bribing people should be the bread and butter of anyone into serious fuckery.

I'll reship twice, just in case.

Reship twice, bribe twice... Do whatever you got to do, man. Just please... Let me get some rest...

Sorry, Fear and Loathing twice in 3 days. I could quote the entire book, let alone the movie, for days without stopping.

But yeah, bribery combined with a happily ignorant bribee who can give no one any information on what mail ever came to their house, "I don't recall a letter like that ever coming to this address officer. Can you prove it was delivered here?" is the way to get things that need doing in person anonymized. You're paying the bribe for the use of the mailbox and the telling of anyone who asks that they have no idea wtf anyone is on about.
If they take your bribe and fuck you over... Well... We're a bunch of freaking hackers and crackers, man. Point the internet at them.