It may be 1000, if you read the following

According to documents from the health ministry's expert panel on vaccines, there were 1,002 deaths (all evaluated by experts) reported as of Aug. 8, of which five cases were found to have "no causal relationship to vaccination." Meanwhile, 997 cases were judged as lacking information to draw a conclusion. There were no cases in which experts said "a causal link could not be denied."

A tweet claiming that various prefectural medical associations across Japan decided not to report deaths due to side effects from coronavirus vaccines has been spreading

https://mainichi.jp/english/articles/20210906/p2a/00m/0sc/016000c

According to documents from the health ministry's expert panel on vaccines, there were 1,002 deaths (all evaluated by experts) reported as of Aug. 8, of which five cases were found to have "no causal relationship to vaccination." Meanwhile, 997 cases were judged as lacking information to draw a conclusion. There were no cases in which experts said "a causal link could not be denied."

A tweet claiming that various prefectural medical associations across Japan decided not to report deaths due to side effects from coronavirus vaccines has been spreading

https://mainichi.jp/english/articles/20210906/p2a/00m/0sc/016000c