Randy Guijarro is the kind of guy that will spend all day happily digging through thrift shops for treasures. Lucky for him, it's paid off. A few years ago, he was looking through some "junk" boxes, when he found three tintypes – old pictures printed on thin metal sheets. Really liking them he bought all 3 for $3.

When he got home, he was looking at one particular one with a magnifying glass and thought he recognized one of the people in the photo – famous outlaw Billy the kid. Googling for images of Billy and his gang, they found photos that matched the faces of the men in the tintype. They took their find to collectors, who were skeptical and took their time authenticating the photo. After a year, they managed to identify all 18 men in the photo – all members of Billy the Kid's gang, playing croquet.

They also found the place where the photo was taken in Chaves Country, New Mexico and even found the original building.

Thus far there's only one other photo of Billy in existence and it was sold for $2.3 Million in 2011. At the moment, Guijarro's had the photo appraised and insured for $5 Million and is just hanging on to it.