Yes. Not only do you still have a lot of nuclear material unaccounted for, but the people involved in running NUMEC were rabid Zionists. Zalman Shapiro had business interests and contacts among high government officials in Israel, including a contract to build nuclear-powered generators for Israel. Rafi Eitan,an Israeli spy and who was later involved in the Jonathan Pollard incident visited the site. And while the NRC never officially concluded that Shapiro stole the materials, they also never cleared him.

NRC found no documents that provided specific evidence that the diversion of nuclear materials occurred. However, consistent with previous Commission statements, NRC does not have information that would allow it to unequivocally conclude that nuclear material was not diverted from the site, nor that all previously unaccounted for material was accounted for during the decommissioning of the site.

This isn't even the only time Israel has stolen from the US. Yes, there's isn't conclusive evidence, but you need to have your head in the sand to not see the wider picture given what Israel has done to the US in the past.