It’s got nothing to do with Thailand it’s the fb world.
I received a friend request from a fb friend 2 days after he died… I reported but they didn’t shut the profile down.
I also received one from my aunt, which they also haven’t taken down.
The fb reporting system is a quagmire of bureaucracy.
As to your friend, just don’t pay until the item is inspected… convenient ? No.
Is it more convenient than losing your money… yes.