Take it to a museum, get an expert to certify its age & manmade origin, sell it on E-bay or Sothebys, retire.
I have a scraping tool, found it on Ft. Meade grounds about 20 years ago (under a couple inches of dirt), cut from unimpressive quartz but *perfectly* sculpted for the human hand, and a reasonably sharp scraping edge.
No one should dig around Ft. Meade, lots of unexploded ordnance including a full, unused belt of .50 cal uncovered the same day I found the scraper.