Speaking outside court following the verdicts, Det Supt Riddell said: “As part of the investigation, a number of other arrests were made, but further charges could not be brought at this time.”
He urged anyone who may have new information regarding those involved to contact the force.
Throughout the “complex investigation”, the force had made “multiple arrests” and “investigated numerous scenes across the country”, he said.
Gang kingpin Sheen, from Oxford, pleaded guilty last year after police found his DNA at the scene and gold fragments in his clothing.
He was described in court as the “common denominator”, having been charged with planning and transferring criminal property, as well as burglary.