You used to be able to get the cal certs/data from the KS website with serial number lookup (got one for my meter a couple years back). Doesn't seem to work any more though, not sure if it's deliberate or just broken. Maybe worth pinging KS if the seller doesn't respond.
Anyway enjoy the meters (and don't forget there's extra features to enable in these ones), seems like it was a great deal in the end.