When many, if not all, retailers take back products that have been opened, they can't sell them as new. They have to reduce the price.
I've had people buy EOTech sights, rangefinders and other things and then want to return them. When I got some of them back, it was obvious that the items were used: bunged screws or threads, scratches, or other signs. The customer always insisted he didn't mount the scope, use the rangefinder, etc.
Because the item was obviously used, I have to sell it at a loss on Ebay.
I admire your honesty, Grandpa Shooter.