Hello Mike,
You're right about not being sure.. I hope my reply isn't too late too!
The site Fansevery.com is based in China so there is no way the jerseys are authentic. Best to move on and look elsewhere.
Here's a forum thread that has a list of dropshippers selling authentic jerseys -
Link hidden: Login to view
Hope this helps :)
Btw, welcome to SaleHoo!