Investigative sources say a house owned by Inaba Atsunori, a former manager of Japan's Olympic baseball team, was burglarized this month in Aichi Prefecture.
Sources say Inaba's father came home and found that rooms had been ransacked at the house in Kita-nagoya City, Aichi Prefecture, on March 11.
Police have confirmed that about 3.6 million yen, or over 27,000 dollars, in cash, a ring commemorating the 2009 World Baseball Classic and other jewelry were stolen.
Inaba played in the 2009 WBC for the national team, which won the title.
Inaba is now the general manager of the professional baseball club Nippon Ham. His father lives in the house.
A witness reportedly saw a suspicious vehicle in the neighborhood. Police are investigating.