Keen was paid for his Revolutionary War service with a Cherokee Land Grant but did not live long enough to collect it.

He died after December 12, 1803, in Sampson County, North Carolina. His widow claimed the land grant according to North Carolina Revolutionary War Pay Voucher #3393, Roll #S, 115.104; Smith, Cherokee Land Lottery, 1832, p.34. The land was located in Laurens County, Georgia, which saw many North Carolina Revolutionary War soldiers immigrate to the area based on these “Washington County Bounty Grants.” Washington County later became Laurens County.