At his age, not much you can find out. You may be able to get, for a fee, QSUM from Standardbred Canada or the USTA equivelant but that only gives money earned and life mark. There will be no races left in the system as they purge those with the exception of World Champions and some of those, particularly those that raced when a hard card was the only record, may have the stakes and record setting races in the system. Being absolutely certain this is the horse can only be done if the tattoo is completely legible
I am sure he changed hands several times without papers as papers often got lost in race offices, only to turn up there 10 years after a horse retires, or papers just got lost and some just never got transferred; electronic registration prevents this from happening and the only time you MAY need a hard copy is at a bloodstock sale. Back when this horse was racing, there was no way to get papers unless you were a mamber of SC which then was CTA or USTA although there are now ways around that for non-breeding stock. All you really need, however, is a bill of sale to prove he is yours.
If he is fading and has light areas around the flanks and muzzle, he is definitely brown. I’ve had a 14 year battle with people here about Wallkicker being brown - they insist he is black and he is not as his muzzle and flanks are considerably lighter…and he gets a nasty orangy tinge if he stays in the sun too long.