@Cory76 You need to use the 'Resolution Centre'. Send a 'request money' request to your guest, once you've worked out what it will cost to ship. The guest then has to accept the request, then Airbnb will take money from the guest's card & transfer it to your account.
I've done this a couple of times, when shipping small items left behind.
- You could get payment BEFORE you ship, if you don't trust them! (Then they have to trust you.)