As far as I know, 2010 was the first year where there was both a base as well as an auto version of the autographed prospects. Prior to that, they were only available as autos (hence why there's no base 2009 bowman chrome draft card of Trout). Only thing I can think of is that you have one of the Bowman rookie reprint cards. If you can post a scan, I'd know for sure. Cheers.
Trading for cut autos of baseball HOFers I don't have, autos of current and future Cleveland Guardians, and anything else that catches my eye!