Mine says 22B and appears to be a grade B based on Woots Refurb Glossary Refurbs! A Glossary
Lots of dings, dents, and scratches and was very dirty. Also check your battery health in the battery settings. One of the ones we got was less than 85%
That glossary does not show a grade c though. Also woot support says 24 - 48 hours response but i am still waiting and I emailed last week. Maybe delay because of the Christmas holiday, so I hope they respond soon.