JEZ

Hi everyone im new to this type of thing so please bear with me. I have recently purchased (yesterday) a restored yamaha dt175, the bike has matching engine and frame numbers and is all original. The problem i have is when the guy was restoring it his wife threw out the reg plate and he cant find the v5 anywere. Is there anyway i can find out the original registration from the engine and frame numbers? d.v.l.a. are about as much use as a chocolate tea pot. Any help would be real good. jez