The 1892-3 Columbian Exposition halves turn up occasionally in boxes, although not often, of course. They were sold at the exposition for $1.00 apiece, but many remained unsold, and eventually quite a few unsold specimens were released into general circulation. Many others were melted by the government. They were popular as Christmas gifts, and until circa 1920 or so were offered by New York City department stores at face value during the holiday season as a courtesy to customers who wanted them. Many found their way into pocket change. It's still amazing to find one from a bank box, nonetheless, more than a century after they were issued. Other silver commemorative halves were also released into circulation when many specimens went unsold, and these, along with the Columbian halves, are of course the ones most likely to be found in boxes by roll hunters, even though the likelihood is small. But people have found Columbian halves, Booker T./Carver halves, Stone Mountain halves, etc. You just never know.
