I don't think that user name is the seller - it's the buyer. The 'username' and the name on the package of the addressee are almost identical. It could simply be a buyer who is using an old address, so not a scam.
I would do as you are doing and send the parcels back as 'not at this address'.
You should not name members in here and the screenshot shows what I assume is your address so your post will probably be edited by a moderator.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)