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I have had 3 discusions with wardens this year about that very thing. How old is the kill? Obviousely you have photograpks to prove it had a tag at one time. If it is a more rescent kill like in the 2000's call fish and game and see if they can look it up. If it is before then , all and any info you have about your Grandpa, when and where it was killed . And also your info is what a Taxi would need. I would have you write it all out on a piece of paper then have you sign and date it. And then enter it into the books and put that signed paper with it.