It comes a day after Israel said Ms Bibas was not among the four bodies handed over on Thursday and that it received an "anonymous body without identification".
Hamas says the body of hostage Shiri Bibas has now been handed over, according to the group's Al-Aqsa TV channel - as the Israeli military says it is checking the reports.
In a statement, the Israel Defense Forces (IDF) said: "Following the reports regarding Shiri Bibas, they are currently under review.
Ms Bibas was kidnapped with her sons - four-year-old Ariel, and nine-month-old Kfir - from the Niz Or kibbutz during the group's terror attack on Israel in October 2023.
Hamas claimed there was the "possibility of an error or overlap in the bodies" which may have been caused by Israel "targeting and bombing the place where the family was with other Palestinians".
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