Log into your Apple ID on a desktop browser and see what devices are still associated with the ID. I too have bought and sold several Apple devices, but sometimes I forget to disassociate them with my Apple ID account. Worth a try.
I think OP has said (twice) that he has already done this.
OP, as others have said, the location of the attempts is less important than the fact that they are not associated with anything you have initiated. The location shown for my logins which require 2FA is always inaccurate.