Most of the sellers just use delivery confirmation, due to the fees with certified & potential delay if the person you're sending the package to isn't home at the time of delivery. If you print the postage out through Paypal & include delivery confirmation the tracking number is on the transaction info and shows up in Paypal and in "My Ebay".
The only thing about delivery confirmation though, it's only a record that the package was delivered and to what address, not that the actual person you addressed the package to received it...as no signature is required. This is where you have to make sure to only ship to a Paypal confirmed/verified address to "cover your ass", as there is no fraud protection if you would ship to an unconfirmed one.
Had my account by them froze over 8 years ago, (my account on Ebay was hacked, I caught it quick, but they froze my Paypal account as a "precaution") had a hell of a time and spent over a month on the phone trying to get them to unfreeze it.