Where is the location for the Amazon return in the store?

Yes, in the back. The kiosk at the front is only for items purchased in store or through the Kohl's website. The one in the back is for everything else.

I think it's in the rear of the store near bedding dept. It is displayed.

It's located back near the bedding. They moved it from the front of the store

There was a kiosk/desk near the front entrance inside the store.