I can't imagine. There are three figure skate sharpeners in town, and I've used two of them; neither engrave anything on blades. I doubt the third would either. The one I go to now has a first name starting with a B, but again, I've never known him to do that.
The owner of that pair could have gone to a hockey pro shop, I guess, but a.) the hockey places here probably know not to sharpen figure blades, b.) figure skaters here learn quickly who the sharpeners are, and c.) if someone has Gold Seals, they DEFINITELY would not be going to one of the hockey shops.