At issue are the bodies of Lt. Hadar Goldin and St.-Sgt. Oron Shaul, presumed to have been killed during the 2014 Gaza war, and the fate of two Israeli citizens, Avera Mengistu and Hasham al-Sayed.
"Everyone must do their part to facilitate ongoing discussions to stabilize the situation on the ground and avoid another devastating escalation in Gaza," he said.
Hamas has fired mortar shells at the Kerem Shalom crossing both times Israel has tried to open it to humanitarian aid and shipments of essential supplies.
A 19-year-old Israeli soldier was injured by shrapnel as his unit was overseeing the distribution of gas, food and medicine to Gazan residents.
Both the crates and the gold were confiscated, and the incident is being investigated by security forces and the Israel Tax Authority.
Michael Peretz, a resident of southern Israel, received millions of dollars for smuggling equipment believed to be used for rockets, missiles and other weapons.
Israel barred the passage of fuel and all but humanitarian items into Gaza in response to continued rocket attacks.
Kerem Shalom is Gaza’s main commercial crossing, and its closures by Israel are often a sign of heightened tensions with Hamas.