inheritance." >> in 2009, five years after they inherited two locked gun safes, the family of roy roberson finally time to solve the mystery inside the vault -- that is if his son, roy jr., can ever figure out the combinations on their father's gun safes. >> he came up with this combination that was very complicated. it was like a rubik's cube puzzle. we didn't know how many rotations, and it was very easy to get the numbers out of order, and then he left out a few numbers. >> so, how long did it take? >> days. >> days to crack them open. >> i think that was one of his final practical jokes on me. >> what he finds inside is nothing to snicker at -- nearly 200 antique firearms, the most rare among them a complete collection of every historic winchester, the rifle that won the west -- short- and long-barrel models of each. >> it was almost like taking a sack of rare coins and realizing, "hey, wait a minute. every date is here and every mint is here." >> roy aims to put some of his dad's guns on display at fort chadbourne, which roy sr. had spent his later years helping to restore. but when w

. >> i'm roy roberson. >> i don't think he wanted anyone to have the combination, because that was hise pandora's box. >> ...the other a texas-sized challenge. >> this may be financially one of the dumbest things that i have ever done. >> together, can they make history? >> fire! [ explosion ] [ door creaks ] [ wind howls ] [ thunder rumbles ] ♪ bird caws ]