Now, I love a scooby doo mystery. A google search turns up that number 281-465-8266 only on that website on the whole internet. It didn't turn up a phonebook result, oddly enough.
Superpages.com reverse look up turned up 2 listings with different address (WTF?) you can see them here:
http://www.whitepages.com/10866/search/ReversePhone?phone=++281-465-8266
One appears to be a business---HOWEVER---I did not do a business search, I did a people search. Maps reveal those two address are actually in woodlands, tx and are not all that far apart. Let us google the name of the business and the name of the person.
They've got a yellow page listing here (under electronic equipment and supplies--same phone number):
http://www.firstchoicedirectories.com/pdf/moco05/eheading.pdf
I find nothing referencing the persons name and that company. Try calling and asking for that lady by name. That's what I'd do. If they say "who", then maybe you start breaking their balls. A threat to call to code enforcement, ect. A neighbors search of the people pages turned up nothing. That may indicate an industrial area!
Anyway, paypal ought to back you unless the seller can show proof the product was delivered. They can only get your cashola back if the guy has enough in his paypal account, though. Its part of the TOS of dealing with paypal.
They have lots of haters, but I find that as long as you play by their rules (cross the t's and dot the i's) and watch your own 6, you'll have no problems. Know your products and your potential buyers. Some stuff is more risky for fraud.