... I don't know about that, Jill. True, Robert West had to provide evidence of all those whom he paid to be imported into the colony, even giving age, skills, et cetera. But once his headright land grant was obtained, the evidence was... ah... discarded. The colonies back then did not have giga-bytes of storage for their past information, nor room for warehouses full of boxes as one sometimes sees potrayed on TV programs today. As for a tombstone, the land Robert owned was lowlying and any local stone was even less able to withstand the forces of nature than the porous limestone around Chattanooga. Witness the trouble the TVA had from the leakage of a dam on the Tennessee River not far downstream. The mountains around there owe their continued existence to the far less porous sandstone caps on their tops! Time and water are great eroding factors to all sorts of otherwise apparently solid stone. Even granite.
If 'our' Robert was given a tombstone after his death, I sincerely doubt it still is legible, much less existent.