Here is the info he had on eBay........
Original Powder Horn from the Daniel Boone Family
My family has had sole possession of this powder horn since the 1800s. When I was in my teens, my mother told me that her grandmother had been a close friend of a Mary Sholl, who was a daughter of one of Daniel Boone’s Daughters (Levina). Mrs. Sholl gave this powder horn to my great-great grandmother, Sara Masters, when her family moved from Missouri to Iowa in 1885. The powder horn had seen many years of use before it was given to her. I was told this powder horn dates from 1820 to 1840. She gave it to her daughter, Ruth, who in turn, told her own children (there were 5) that it was owned and used by the Boone family, perhaps Daniel Boone himself. My mother inherited it.
I was given this information approximately 45 years ago and have no demonstrable proof of the lineage of this powder horn except to state that my mother was absolutely certain (and very proud of the fact) that this powder horn belonged to the Daniel Boone family. There is no reason to doubt her family's oral history.
This powder horn still has grains of gunpowder inside. It has the original hand-carved base-plug and brass fittings for a sling. It was in a display case for many decades and is in remarkable condition.