Investigators said a framed Ken Griffey Jr. jersey and other baseball memorabilia was also taken along with televisions and other electronic items, The Seattle Times reported. They believe the break-in occurred between Wednesday and Friday last week.
The house in Mount Vernon north of Seattle is up for sale. An open house was held there on March 27, and real estate agents and prospective buyers have been in and out.
Kendrick, a three-sport star at Mount Vernon High School, joined the Phillies in 2007. The team won the World Series in 2008.
Lt. Chris Cammock of the Mount Vernon police called the World Series ring, which is encrusted with diamonds, "priceless." The ring was stored in a safe.