Look first at the seller's reputation. In this case, it is OK.
Next, particularly for a used item, look at any return options. The paypal protection protects primarily against non delivery of the item.
In also protects against items that are not described properly. In this case, the only description is refurbished, and they
do guarantee against DOA. Since the seller has several potential replacements, I might think you would be ok.
For what it is worth, I like to look for used parts from users who just want to market parts they no longer need.
They are not in business to make money, and will start the auction low. I do this regularly with parts I no longer need.
I always include 14 day money back for any reason, unless the parts are for repair and non functional.