I’m pretty comfortable with PayPal, but would have my reservations.
I would want a copy of their DL. I would only ship to confirmed Paypal address and only if it matched DL. STI would be safe, but make sure destination address on paperwork is identical to PayPal confirmed. Let the buyer know you will hold up shipping if this doesn’t match.
I prefer paid PayPal transactions when dealing with someone unknown. Avoid friends and family. PayPal will not have your back if shit goes south when they are working for free. They want to get paid too.
Make sure you have lots of well documented photos and a date stamp of some sort...current newspaper or something to prove date of photos.
I would still have reservations why they are purchasing from across the country, unless it’s a rare title or they are in a very remote area.