The FAA registry carries N9865C as msn 108-32109 (TB-25N) which translates, at least in most B-25 lists, as 44-28834. I think I have a copy of the civil registry file for this airplane and will double check it, but I think it has been carried in the FAA files based on its msn and not its Army serial number since it was first registered back in the late 1950s. If the file has the USAF sales agreement (most do), that would be definitive as the military serial is shown. If so, I will post a copy here when I get back to my files this weekend.
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Scott Thompson
Aero Vintage Books
http://www.aerovintage.comWIX Subscriber Since July 2017