It can be very handy. Five or more years ago, when you returned an item, they'd manually mark the line in your receipt, which works well enough. Yesterday I h

It can be very handy. Five or more years ago, when you returned an item, they'd manually mark the line in your receipt, which works well enough. Yesterday I had to return an item for the first time since then, and after they read the barcode on my receipt from 2 months ago, I saw the whole receipt, or at least the end of it, flash on a small user facing LCD, and they didn't have to do anything else with my paper receipt. For a product quality return like this I can see many ways in which this would be useful.