Nothing new found as far as a flintlock Hawken - of course it would not still be flintlock, so when we see a a fullstock plains rifle with a Hawken stamped barrel, fixed breech, drum and nipple, and a lock which appears to be converted from percusssion, that is as close as we are going to get.
Expecting a very early, flintlock mounted Hawken to have all the classic features of later guns is probably unrealistic also.