Tyler Schaefer found the neatly stacked bills Saturday in the room where he and his father, Cody Schaefer, were staying at a hotel near the airport, The Kansas City Star reported.
Cody Schaefer said Tyler, a Cub Scout, is always on the lookout for clues and treasure.
"He looks for stuff at random," Schaefer said. "He's very observant."
Schaefer said after they checked into their room Saturday, Tyler began opening all the drawers, and it wasn't too long before the boy announced: "I found money!" Schaefer thought maybe his son had found a forgotten $10 bill, but when he looked closer he saw the stack of bills totaling $10,000.
They handed the money over to two off-duty police officers working security at the hotel. The money is being stored at a police facility.
According to a Missouri statute, lost money could revert to a finder after about seven months if no one can prove ownership. But the owner then has another year to prove the money is his or hers and claim it from the finder.