I got a blizzard cheif in a trade, and i have no idea how to tell which run it is!
I don’t think clyw does many repeat colorways on the same model, so usually the colorway is a huge hint. You can search pictures of each run (ie. “chief 5th run”), and see if you can pick out your colorway. This is what I did with my AC and Chief, and I was correct (confirmed by Chris). Speaking of Chris, you can also just ask him, his memory is pretty good with those things. Good luck!