Robert Durst was fully prepared ​to start a new life before his Saturday arrest — with ​more than $42,000 in ​cash ​on​ hand and a full-faced ​latex ​mask and fake IDs, according to ​court documents.

The ​creepy 71-year-old murder suspect had a full latex mask that completely altered his facial features, ​the cash​ in hundred-dollar denominations and a fake ID in his New Orleans hotel room — in addition to the .38 Smith & Wesson revolver with four live rounds and five ounces of pot, acco​​rding to a search warrant from Harris County​, Texas, where Durst has a home​.

​The warrant listed the evidence found in Durst’s hotel room to help make the case for a search of his Houston home, which was conducted late Tuesday, with authorities removing boxes of potential evidence.​

Durst’s fake Texas ID was ​in the ​same name he used as an alias to check into the JW Marriott on Canal Street ​in the Big Easy​— Everette Ward — where he was arrest​ed​.

Bank records obtained by authorities show that Durst was pulling out $9,000 daily from one of his bank accounts for more than a month, amounting to $315,000, according to the warrant.

Durst is worth $100 million and therefore “has the means to flee outside of the United States,” the warrant said.

​Law enforcement sources have told The Post authorities feared Durst was going to make a run for it to Cuba, which has no extradition treaty with the US. ​

​In the Houston search, authorities also found two copies​ of the book “A Deadly Secret: The Strange Disappearance of Kathie Durst​,​”​ ​one paperback and one hardcove​r.

​Author​ Mark Birkbeck said he wasn’t sure what to think of the new discovery.

“I had heard he had read the book, but I didn’t know he was carrying it around with him,” Birkbeck told The Post moments after he heard the news. “He was just on national television. He likes to see himself on TV. I guess he likes to read about himself.”

Durst is facing charges of illegal possession of a firearm by a felon and possession of a firearm in the presence of a controlled dangerous substance in New Orleans and one count of first-degree murder in California.

Meanwhile, court papers made public on Wednesday revealed that jailers in New Orleans have deemed Durst a suicide risk, and used that assessment to win court permission to send him to a jailhouse pysch ward about an hour outside the city.

On Tuesday, a New Orleans judge refused to let the Orleans Parish Sheriff’s Office transfer Durst to the Elayn Hunt Correctional Facility in St. Gabriel.

But the Louisiana 4th Circuit Court of Appeal overturned that ruling hours later, saying Sheriff Marlin Gusman had “sole discretion…to determine where to house inmates in need of mental health treatment.”