Opinion: Detroit Tigers Ausmus GU?

[mlupo]

I'm not sure if this is a GU, GI, or retail authentic. I bought this jersey on ebay a couple years back with the idea that it was an autographed retail authentic from 2000 with the Comerica Park first season patch. The listing was pretty simple and only had a photo of the back of the jersey and maybe one of the auto. The seller never said it was GU or GI, but when I received it I noticed the markings on the tag and it made me wonder. There is no wash tag or tag of any kind on the inside, also no size tag. My guess is that it is a retail authentic, but maybe a Game Issued? I know the "JS" are initials of the Tigers clubhouse manager, but I have never seen a Tigers tag with an "I" or "N"(maybe they stand for Issued and Not Worn). Any help would be great.