Kenny Roberts

good evening I am new to this site , I used to have a wrangler 125 when I was 18 , yes many years ago, i recently purchased a Rd125LC  , B reg in white , the V5 form says Yellow, which would be Kenny Roberts colours , the guy who I purchased it off said he sprayed it white , don't know why but he did  , he said he didn't know it was a limited edition, how do i find out if it was actually a yellow Kenny Roberts , edition and not just sprayed yellow before , thank you