@Bry0
"A guest sent me some money to return some of their items,but as mentioned in various conversations I do not have them anymore and therefore can not send them. I am worried the guest is going to cause issues for me by claiming he sent the money but never received the goods "
I would not worry too much about it just yet.
1. Why did he send money if you have already said you dont have the items ?
2. I dont believe you can reject the money being sent. What you can always do though is send an exact amount back once you have seen that the money has been credited to you.
3. "I dont have them anymore " - does that suggest you had them ? ..I assume you explained what happened to them if indeed you did have them
4. Keep any messages within the Airbnb messaging system
5. If you receive "aggressive" messages etc then report the guest to Airbnb or ask the guest to open up a Resolution case and you can then only deal with Airbnb and avoid further contact with the guest.