difference between premium refurbished vs gamestop refurbished?

I was browing the console systems on gamestop.com, anyone know what are the differences between a premium and a regular used console?

I'd like to know this myself.

I think premium means it's brought back to manufacturer specs but it's used. GameStop refurbished means GS wiped it clean and sells it.

I just called 2 different Gamestops because I'm looking for an item that's low in stock. I threw in this question, and both employees were like "I've never heard of premium refurbished." One did say "Maybe premium comes with a warranty", but his uncertainty didn't convince me.