The FBI have recovered one of the gold bars stolen in a $5 million armored truck robbery in North Carolina last month. Investigators say the location the bar was found - somewhere in South Florida - has provided them with a big break in the case. 'This confirms that there is a South Florida nexus to this,' Justin E. Fleck, supervisory special agent of the squad leading the investigation, told ABC News. 'We believe that additional gold bars from the robbery may still be in South Florida and we continue to need the public’s help in solving this crime.' The highway heist occurred on March 1 in Wilson County, almost halfway into the truck's journey from Miami to Boston. Police have previously said they suspected it was an inside job because the 18-wheeler truck - owned by transport company TransValue - pulled over when one of the two armed guards on board 'felt sick'. Big break: The FBI say they recovered this 26-pound gold bar - worth up to $500,000 - somewhere in South Florida, which has provided a big break in their investigation into last month's highway heist in North Carolina . The guards said that after the vehicle stopped they were approached by three armed men driving a white van who ordered them to lay on the ground. The men spoke in Spanish and said they were 'policia.' The trio tied the guards' hands behind their backs and marched them into nearby woods before taking 275lbs of gold. The gold totaled $4.8 million, but the truck was carrying about $10 million worth of metal, so the thieves left half the load - mostly silver - behind. Suspects: Police previously shared sketches of the suspects thought to be male and possibly Hispanic who allegedly bound the hands of the driver and the passenger. There are three suspects altogether . White van: Two security guards working for Transvalue Inc of Miami were reportedly approached by three armed men driving a white van, pictured here, after pulling over on the interstate . Wilson County Sheriff Calvin Woodard Jr. admitted last month the story was suspicious. 'There is suspicion at this time that this could be an inside job due to the circumstances of the robbery,' a Wilson County Sheriff's Office detective wrote in a search warrant obtained by ABC. 'The fact that the truck was robbed immediately upon it pulling over at an unannounced stop is suspicious in and of itself,' the document added. 'It is also suspicious because there are no markings on the side of the truck that would indicate the type of cargo contained therein. 'The suspects also went directly to the trailer and found the gold which was in unmarked five gallon buckets. It is not believed that this is a random act due to the nature and facts of this robbery.' Police are now seeking a search warrant for the phones of the armed guard who felt sick because of the suspicious nature of the case. Search: Armed robbers are suspected of stealing $5 million in gold from an 18-wheeler taking the precious from Florida to Massachusetts on Interstate 95. Above, deputies investigate a wooded area near the road . Location: The men 'ordered the guards to lie on the ground, tied their hands behind their backs and marched them into nearby woods, before taking 275lbs gold' Cone: This photo is of a traffic cone that was positioned behind the truck as suspects allegedly removed gold from the vehicle after breaking a lock on the back . Investigation: Wilson County Sheriff Calvin Woodard Jr, pictured, said that differing stories from the guards about the armed robbery had led to suspicions over their accounts of the heist . Woodard shared sketches of the three suspects who allegedly bound the hands of the driver and the passenger. Meanwhile, a photo was shown of a traffic cone that was positioned behind the truck as suspects allegedly removed gold from the vehicle after breaking a lock on the back. The traffic cone had the marking of a company that only does work in Florida, according to ABC. Woodard said the driver and the passenger, who speak little English, are not suspects, but both men have been interviewed separately several times by police. He added that the driver and the passenger did violate their company’s policies by exiting the vehicle without their firearms and leaving the firearms inside the truck. Wilson County Sheriff's Deputies investigate an area near Interstate 95 in Wilson, North Carolina, on Monday . Investigation: The Federal Bureau of Investigation has joined in the search for the robbers, thought to be male and possibly Hispanic. Neither of the guards was injured during the 'very rare incident', TransValue said . A reported 275lbs of gold were stolen and silver was also being carried in the truck, which was stopped near mile marker 114 on the highway. Locks on the back of the truck were sawed off, according to WITN. The Federal Bureau of Investigation has joined in the search for the robbers, thought to be male and possibly Hispanic. The metal was owned by Republic Metals Corporation in Opalocka, Florida, according to a search warrant. TransValue, which specializes in transporting valuable goods and money between financial centers, keeps goods they move insured for up to $100 million. A $50,000 reward is on offer for information leading to an arrest. Shortly after the heist confused drivers told 911 dispatchers that they saw uniformed drivers run into the North Carolina highway with their hands bound, motioning for help, according to recordings.
Heist occurred March 1 in Wilson County, North Carolina . Armored truck traveling from Miami to Boston was robbed by three men . 275 pounds of gold worth nearly $5 million stolen . A 26-pound gold bar worth $500,000 now recovered in South Florida . Police previously suspected it was an inside job . The guards had pulled over because one felt sick . Goods transported with company, TransValue, insured up to $100 million .