From the Springfield News-Leader:
The couple, William A. Graves and Misty Graves, were caught near the site in January, after park rangers were alerted to recent looting at a well-known archeological site in the upper district of the park, according to a news release from the National Park Service.
At the time of the arrest, William Graves was carrying digging tools and wearing boots that matched impressions found near the looting site, the park service said, while his wife was found with their vehicle at the trailhead in possession of several artifacts and a pick.
A search warrant at the Graves’ home turned up additional tools and evidence, the release said. After a six-month investigation, the Graves were indicted in federal court. William Graves, who subsequently admitted digging in the park, also turned in “71 stone tools, projectile points, or other artifacts” he said came from the site, authorities said.