If they stop selling the F1s, I'd still think it's good to ask the breeder, but if it's something like Black Lime Reserve where Mean Gene has said he doesn't work with that because it was Aficionado stuff, it's up for grabs.
Never heard of Purple Caper. Their stuff looks sketch, and calling a bx the original name of the strain is disingenuous. Why are they calling it Cookies F2 instead of Cookies BX2? Did you see this?
https://www.purplecaperseeds.com/contact/ They only sell in 4 places, 2 of the links don't work, the other 2 don't carry their stuff...