Who is Roy Antigua? 

Authorities are not sure what Roy Antigua's intentions were when they found hundreds of ID badges and the uniforms of different federal agencies at his home earlier this month.

That's the question New Port Richey, Fla., Police Chief James Steffens posed to reporters at a news conference Monday.

Is he an officer in the U.S. Coast Guard as he previously claimed? An employee of NASA? Or just an impostor?

Police are trying to figure what Antigua, 52, was doing with hundreds of suspicious items they found during a search of his home after he was arrested earlier this month for an unrelated offense, the Tampa Bay Times reported.

"Is he really a threat or is he someone who is living a very involved fantasy life?" Steffens asked. 

During the search police found military, law enforcement and medical ID badges and uniforms from various federal agencies, including U.S. Customs, the Navy, Secret Service, the CIA and Homeland Security.

Watch US News videos on NBCNews.com

Authorities also found military medals, a flight instructor badge and a Boy Scout troop leader uniform, according to the Times.

Ammunition for semiautomatic guns and assault rifles were found but no actual weapons were located. 

Also found were medical instruments, a badge saying he was a physician's assistant and a photo showing Antigua holding a newborn while wearing medical scrubs. 

According to Florida Department of Health records, Antigua is a licensed respiratory care practitioner.

He reportedly admitted to police to owning the items.

The only true piece of identification found was a card stating Antigua was a member of the volunteer group, Coast Guard Auxiliary in Miami, Steffens said. He was kicked out in 2011 after being arrested for grand theft, according to the Times.

The investigation was triggered after an officer, also a Marine veteran, noticed Antigua's military ID looked fake during an Aug. 1 arrest for driving without a license and violating probation on the grand theft case.

Stay informed with the latest headlines; sign up for our newsletter

Some details about Antigua's life have come to the surface. Authorities found out he's from Cuba with family in the Miami area, the Times reported.

Antigua played out his role as a federal employee so well, his Cadillac Escalade was outfitted with a Homeland Security registration sticker, Coast Guard license plates, blue flashing lights and handcuffs, according to the report. 

"He is remorseful," Steffens told the paper. "He said this was something that got out of hand."

The two men had previously crossed paths at a Memorial Day event where Coast Guard "Lt. Cmdr. Roy Antigua," who was dressed in uniform, introduced himself to Steffens, according to the paper.

"Everybody around there thought that he was the real deal," Steffens said.

Police are working with hospitals, the military and federal law enforcement agencies to see if Antigua had any connection or dealings with them. 

Antigua is currently being held without bail in the Pasco County Jail for the violation of probation charge. He has not yet been charged with anything related to the items seized at his home.

More content from NBCNews.com:

• Giffords, husband satisfied with proposed Loughner plea deal
• Missing best friends found dead in New Jersey river
• Trayvon Martin's mother seeks damages, compensation in son's death
• For Loughner, cost-benefit calculation to the death penalty
• Experts: Temple gunman used pseudonym 'Jack Boot,' led band
• Video: Athletes reveal the royal who makes them swoon

Follow US News from NBCNews.com on Twitter and