When I say I have shot them a few miles north of the Kansas border, I mean less than 8 miles as a grouse flys from the actual border, by map, and in two different counties, Harlan and Nuckolls. In Nuckols, it was an extremely bad winter, and we saw a flock sitting on the ridge top of an abandoned barn, in the middle of a piece of prairie grass right on a gravel road. Since sharpies are known to do short migrations dependent upon weather, food source, and unknown reasons, I have no doubt that an occasional sharptail or flock cross the border. If your question is a sustainable population of some kind I doubt it exists. However there was discovered in Ray County, Missouri a flock of greater prairie chickens in the middle of intensely farmed ground, with a lek on the top of a Missouri River dike, surviving where they were thought to be gone 100 years ago. If they are not present and breeding now, there are specific reasons why there won't be sharpies in Kansas ever again, but that's a different topic.