The details suggesting the attack may have been planned months in advance were part of more than 300 pages of search warrants unsealed by a federal judge in Nevada, according to the Los Angeles Times, one of several publications that sought release of the documents.
A federal judge on Friday made public more than a dozen search warrant affidavits that had been filed by the FBI in the days and weeks after the shooting.
The Review-Journal and other media organizations continue to sue for the release of several other Las Vegas shooting records, including body camera footage and 911 calls.
While the unsealed documents corroborate earlier confirmations from law enforcement officials that Marilou Danley was out of the country at the time of the deadly shooting, investigators also believe or at one time believed that Danley was "the most likely person who aided or abetted Stephen Paddock."
A document released Friday said more than 1,000 rounds of ammunition and 100 pounds of explosive material was found in the vehicle. The Las Vegas Metropolitan Police Department did not respond to calls seeking comment.
An hour before Las Vegas cops released Stephen Paddock's name, Danley deleted her Facebook account, according to newly released documents about the October 1 mass murder of 58 people attending an outdoor country music concert on the Strip.
Later that same day, the first account received a message stating: "we have a wide variety of optics and ammunition to try".
One instance where investigators identified two email account attached to him - CentralPark4804gmail.com and CenterPark1live.com - an exchange began with "Try an ar before u buy".
The Los Angeles Times reported that investigators were not sure why Paddock would send emails between accounts he controlled, or whether one was controlled by another person.
A CNN review of public records shows that the email account linked to the sender is associated with a "Steve P".
It appears Paddock exchanged emails with himself, a fact that puzzled investigators.
Danely offered this information as investigators were preparing to take a DNA swab from her, the records state.
In the court documents, she told investigators she occasionally participated in the loading of the magazines.
Newly unsealed court documents show that, in the months before the massacre, murderer Stephen Paddock took measures to muddy the waters in the law enforcement investigation he knew would follow his despicable act.
The agent also noted: "this aspect of the investigation is still the subject of intense review".
The documents show that Danley's Facebook account was set to private at 12:30 a.m. October 2 - about two-and-a-half hours after the rampage began - and was deleted at 2:46 a.m., less than an hour before authorities released Paddock's name to the public at 3:30 a.m., the Las Vegas Review-Journal reported.
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