They had previous seized 2 lb back in November of last year. So how much has gotten through without being stopped? The black market for uranium is real:

Turkish paramilitary police have seized more than 33 pounds of weapons-grade uranium and detained two men accused of smuggling the material, the state-run Anatolian news agency said on Saturday.

Officers in the southern province of Sanliurfa, which borders Syria and is about 155 miles from the Iraqi border, were acting on a tip-off when they stopped a taxi cab and discovered the uranium in a lead container hidden beneath the vehicle's seat, the agency said.