Cofer told Henderson police he was watching his son's high school baseball game when the break-in occurred Thursday at his four-bedroom home.
Cofer's ex-wife, Lisa Cofer, told the Las Vegas Sun the thieves also took a coin collection, an Xbox game console and several games. She says they left a diamond ring.
Lisa Cofer didn't immediately respond Monday to a message from The Associated Press.
He moved to southern Nevada in 2001, and is an assistant high school football coach.
Copyright 2013 by The Associated Press