At a recent show someone brought me a Hanne Popow he had purchased from me a couple years ago with fischeri on the tag. It was purchased as a small seedling.
The breeders flasker got them mixed up. The breeder was very up front and let me know as soon as he thought there might be a problem (because the seedlings were getting to big to be fischeri). That was maybe a couple years ago. I'm pretty sure he would have notified all the people that bought flasks.
Unless this is a major coincidence, it looks like some of the seedlings got out there.