Authorities in Miami are trying to determine if any Australians were caught up in the collapse of a residential building in Florida amid reports that a Melbourne couple is missing. At least one person is dead and at least 99 are missing, Miami Herald reported. Meanwhile, rescue crews are searching for survivors after one side of the 12-storey Champlain Towers South building in Surfside collapsed early Thursday morning while residents were asleep. Joseph Waks, an Australian ex-pat, believes an elderly Australian couple he’s known for many years was in the building at the time. He has not heard from them since the collapse and has been waiting at the scene for updates from the police. “We’re hoping for the best, we’re hoping there’ll be a miracle,” he told the ABC. He said the couple was originally from Sydney but later moved to Melbourne and divided their time between Australia and Miami, …