When I went to the optometrist, he prescribed some new ones. I ordered a new set of expensive glasses at the adjoining shop.

I noticed that the glasses came in an off-brand cheap case. Another customer there noticed the same thing. What the shop was doing was swapping out the expensive case that went with the expensive glasses, and likely sold the expensive ones to a glasses counterfeiter.

I don't use cases, so didn't care, but I thought the shop was pretty scummy.