Well there is already a strain called champagne.. lol
bagseeds, you'll never know.
You can try to guess based on plant appearance, taste, and what you know is being grown in the region of origin... BUT~
Even if you knew the plant that the seeds came off of, what's to say that they didn't get pollinated by the neighbor's outdoor crop?
So trying to nail down a bagseed strain is nigh on impossible.
Just be happy they are good.