Ryne Sandberg Used Cleats - Help Identifying?

[mcastellon]

Hello! This is my first time posting in this great forum. I could use a little expert advice from the community.

I recently purchased this pair of Ryne Sandberg game worn cleats. They're size 9.5, and show light to moderate use, even what appears to be red clay/dirt on their soles.

However, I've had trouble pinning down what year they might be from. I've searched for these Nike Pro cleats, and can't quite pinpoint from what era they might be from. Any thoughts on what year?

Second, any thoughts on what the best service would be to have these authenticated?