Okay, I read about this a couple days ago, and don't absolutely recall all of it, but here's a summary.
Diagio owned a shitload of bourbon at various facilities across the region, maybe even hundreds of thousands or millions, all sitting in aging houses, and not all of the stuff had a purpose. Corn, barley, and rye, and they just never used it or vatted it into something else. So there is this stack of unusual, "unwanted," never used whiskey that reached serious old age, and rather than blending them or so forth, they have released a bunch of single barrel bourbons using this "lost" bourbon. Prices are running over $100 a bottle.
It sounds interesting, but in reality, it sounds like a bunch of generic whiskey was just abandoned because it wasn't useful at the time. When it was realized that they had really old bourbon hiding out upstairs. then the lightbulb went off, they realized that they had something that both suckers and true connoisseurs would be interested in. So, barrel the stuff, use a great label and and image, and gee, it's literally going to fly off of the shelves, just because of the great story..
http://www.orphanbarrel.com/#our-whiskeys