The Brown University shooter took at least four trips to Boston in the months ahead of the mass shooting — as it emerged he drove luxe vehicles back home in Miami, sources told The Post. 

Each visit Claudio Neves Valente made up north was longer than the last as he engaged in an extensive amount of pre-planning and surveillance, a law enforcement source said.

Neves Valente made his first trip of the year from Miami to Boston from Feb. 12 to Feb. 15, the sources said.

That spring, he stayed in the area for 17 days, between April 8 and 25, and in the fall, he went north for 21 days, between Oct. 26 and Nov. 16.

He quickly returned for a nine day trip, staying between Nov. 17 and Nov. 26.

The shooter is also believed to have rented cars each time he traveled to the city, the sources said. 

Down in Miami, he was a loner who kept a low profile — driving multiple vehicles and bouncing around between different addresses.

He drove a Bentley Flying Spur, a vehicle which can cost upwards of $270,000, and a Mercedes S Class, which ranges in price from $120,000 to $200,000 – and also owned a more modest Ford Taurus, a law enforcement source told The Post.

One of his last known addresses was registered in the name of his 91-year-old dad.

The luxury two-bedroom condo in a waterfront high-rise in the hip area of Brickell is worth at least $900,000, according to records and law enforcement sources.

His “devastated” parents hadn’t heard from him for two decades — only seeing him again when his picture appeared in the media after he killed himself, family friends have told Portuguese media.

Law enforcement also descended on a yellow two-story house in North Miami Thursday night, said neighbors, who were barely aware of the killer in their midst.

“He never said a word,” recalled Eddie Pol, a mechanic who lives across the street.

The last time he saw Valente was in the summer, he said.

“I used to see him come and go all the time in his car, but he never spoke. He was always alone,” Pol added.

Valente flew again to Boston on Dec. 1, authorities have said. 

On Dec. 13, Neves Valente carried out his sick scheme, killing two students and injuring nine others before murdering MIT professor Nuno Loureiro two days later.

While investigators have yet to find a manifesto outlining Neves Valente’s motive, sources said he had long simmering personal grievances over past personal failures at Brown — where the former physics student enrolled in a PhD at the Ivy League school in 2000, but left after a year. 

He returned to Portugal to work as a developer at an internet company and never completed his degree, finally returning to the United States in 2017.

Meanwhile slain Loureiro, his undergraduate physics classmate in Portugal, rose to the top of his field — receiving a presidential award in January.

A month later, Neves Valente headed to Boston. 

A tip led authorities to zero in on Neves Valente, who was found dead of suicide in a North Salem, New Hampshire storage facility that a source said he’d owned since 2022. 

In the Portuguese community of New Bedford, Mass., just south of Brown University, locals were stunned that someone from their homeland was behind the mass shooting that killed two students and wounded nine others, along with the murder of the highly regarded Loureiro.

“Everybody is in shock,” Antonio Amorim, a 57-year-old mechanic, said about the tragedy that’s got the entire New Bedford Portuguese community talking.

“The community is embarrassed by this,” he added. “Portuguese people are good people, hard working people. This is bad news for us.”

“I talked to my sister in Portugal. She said nobody is happy with what this freaking guy did… It’s heartbreaking.”

Additional reporting by Georgett Roberts and Angela Mosconi