In 2013 Shimizu unfortunately lost his bronze medal, with the loss becoming major news in Japan and being reported as a possible theft.
With no medal Shimizu turned his attention to Rio 2016 as he intended to win another medal, to replace the one he had lost.
Now however it's turned out that Shimizu has managed to find the missing medal and has appeared on TV with the medal, which was Japan's first Olympic boxing medal since Eiji Morioka claimed a bronze at the 1968 Mexico Olympics.
From what we understand it seems that Shimizu misplaced the medal and was rather embarrassed by the mishap, though of course he was very happy to have found the medal and took the time to thanks fans who had helped look for it.
(Image courtesy of daily.co.jp)