The high-level visit was the first involving an Egyptian Foreign Minister in close to a decade, as FM Ahmed Abu-Gheit arrived in Israel in 2007.
Recently, police tried to reach a number of people they hope can shed light on the affair and could serve as state witnesses, Haaretz said.
Egypt's Foreign Minister Sameh Shoukry's talks in Israel tackled peace talks with the Palestinians and efforts to fight terrorism, Egyptian Foreign Ministry said Monday.
The latest round of peace talks between Israel and the Palestinians ended in April 2014 without results.
Mr. Shoukry's visit comes after he already met with Palestinian President Mahmoud Abbas on June 29 in Ramallah, the de facto administrative capital of the Palestinian National Authority (PA), and after Mr. Sisi urged Israel in May in an impromptu speech to resume the mired negotiations.
Egypt became the first Arab state to sign a peace treaty with Israel in 1979. The initiative offered full recognition of Israel but only if it gave up all land seized in the 1967 Middle East war and agreed to a "just solution" for Palestinian refugees.
Mr Shoukry responded in the affirmative, the official said. Blair tried to get both Netanyahu and Opposition leader Isaac Herzog behind a regional diplomatic initiative that would also entail the forming of a national unity government in Israel, which would include Herzog's Zionist Union. In particular, the two are now sharing intelligence in a common battle against Islamic State militants operating in Egypt's Sinai desert and the Gaza Strip. "Netanyahu aimed at addressing many files... with a focus on the Palestinian issue", the statement said.
The Israel Prime Minister has dismissed the allegations of corruption, which are the most recent in a series leveled against himself and his wife, as "baseless".
Since September, Palestinians have killed 34 Israelis in dozens of attacks.
However, ties have been formally cold over Israel's policies toward the Palestinians, and relations further soured after the June 2012 election of the Muslim Brotherhood's Mohamed Morsi as Egyptian president.
The source continued to say that "If, however, Mandelblit indeed came across such evidence, his main concern would be the interests of the public, and not his own relationship with Netanyahu".
Netanyahu and other Israeli officials have expressed their appreciation of Al-Sisi's statements from May and stressed the importance of involvement of Arab states in the region in attempts to end the Israeli-Palestinian conflict in recent months.
Also on Sunday, Israeli forces arrested at least 16 Palestinians in occupied East Jerusalem and the rest of the West Bank, local media reported.
On Sunday, Shoukry said the Middle East was at "a crucial and challenging juncture".