(CNN) -- Uncertainty over the fate of missing Malaysia Airlines Flight 370 was further compounded Saturday by reports that two men whose names matched those on the passenger manifest had reported their passports stolen. 

Malaysian authorities apparently did not check the stolen documents on an international law enforcement agency database, CNN has learned. 

After the airline released a manifest of the 239 people on the plane, Austria denied that one of its citizens was on the flight as the list had stated. The Austrian citizen was safe and sound, and his passport had been stolen two years ago, Austrian Foreign Ministry spokesman Martin Weiss said. 

Similarly, Italy's foreign ministry confirmed that no Italians were on the flight, even though an Italian was listed on the manifest. Malaysian officials said they were aware of reports that the Italian's passport was also stolen but had not confirmed it. 

On Saturday, Italian police visited the home of the parents of Luigi Maraldi, the man whose name appeared on the manifest, to inform them about the missing flight, said a police official in Cesena, in northern Italy. 

Maraldi's father, Walter, told police that he had just spoken to his son, who was fine and not on the missing flight, said the official, who is not authorized to speak to the media. Maraldi was vacationing in Thailand, his father said. The police official said that Maraldi had reported his passport stolen in Malaysia last August and had obtained a new one. 

U.S. law enforcement sources, however, told CNN they've been told that both documents were stolen in Thailand. 
When?
 Malaysia last August