Absolutely, you need a street address to open the account but can most certainly use a PO box address for delivery so nothing sus there.

You can link up to 8 email addresses so that means 8 different ebay accounts to each Paypal account so nothing sus there.

All parcels now have tracking unless you are using up some of the old red satchels from years ago. Of course if you send as a large letter there is no tracking without registering it but that is up to you and you just have to be prepared to replace or refund if the buyer says it hasn't arrived, not particularly sus as letters do go missing.

What good would photo verification do as a buyer can change the delivery name and address to anythng they want in checkout, they can get the item posted direct to a friend or relative and all  you need is proof of having posted to the address as it was displayed in Paypal.

I have never assumed that because a large letter item without registration has gone astray that the buer is a scammer, I just refund or replace. If an item is more than I am prepared to lose then I register the letter.