Amazing baseball cards found in an attic

From an AP story earlier this summer, via the StarTribune:

DEFIANCE, Ohio - Karl Kissner picked up a soot-covered cardboard box that had been under a wooden dollhouse in his grandfather's attic. Taking a look inside, he saw hundreds of baseball cards bundled with twine. They were smaller than the ones he was used to seeing...

The cards are from an extremely rare series issued around 1910. Up to now, the few known to exist were in so-so condition at best, with faded images and worn edges. But the ones from the attic in the town of Defiance are nearly pristine, untouched for more than a century. The colors are vibrant, the borders crisp and white...

The best of the bunch — 37 cards — are expected to bring a total of $500,000 when they are sold at auction in August during the National Sports Collectors Convention in Baltimore. There are about 700 cards in all that could be worth up to $3 million, experts say. They include such legends as Christy Mathewson and Connie Mack.

Kissner and his family say the cards belonged to their grandfather, Carl Hench, who died in the 1940s. Hench ran a meat market in Defiance, and the family suspects he got them as a promotional item from a candy company that distributed them with caramels. They think he gave some away and kept others...

The Hench family is evenly dividing the cards and the money among the 20 cousins named in their aunt's will. All but a few have decided to sell their share.

Pretty good video at the link.  Presumably some of these have been sold by now, but I haven't seen the report.