I've found the person on FB but I think my messages are going to 'other folder' and not them.
I've tried messaging a few of their contacts too with no response
And one of the items was a bank card so I transfered them a penny with a message that I've found their card and another penny with my phone number but no contact.
There is an address in the items but I don't know if they still live there (as the address is on a card issued 8 years ago) and I'd have to walk there and it's quite a trek.
Any more ideas?