Before killing himself, Paddock engaged police in a firefight leaving one in critical condition, later downgraded to stable after surgery, and another with minor injuries.
Investigators have raided Paddock's 0,000 home, located in a nearby retirement community, but say they have no word on his motive.
She has not been charged with a crime and has spoken to investigators several times, and her lawyer has said she was not aware of Mr Paddock’s deadly plans.
The investigation is continuing, and the warrants only reflect its early stages.
According to the documents, it appears that Mr Paddock relied on the internet to buy many of the items used in the attack, including guns and ammunition, during the 12 months leading up to it.
He spent “significant time and expense prior to the attack purchasing and caching weapons” and other items, such as glass cutters and suitcases.
The FBI said there were hundreds of rounds of spent ammunition as well as “preloaded high-capacity magazines,” found in suitcases that Mr Paddock had brought to the room.
Investigators also found body armour, range finders and a homemade gas mask.
He shot himself dead as officers surrounded a room where he had amassed an 'arsenal' of at least 10 rifles.
He added that his brother had 'no political affiliation, no religious affiliation, as far as we know' and that he'd never been 'an avid gun guy at all', adding that he was at a loss as to where Stephen got his arsenal of automatic weapons from.'He has no military background,' he added to CBS News.
As he meticulously planned the Las Vegas attack, the man responsible for the worst mass shooting in modern American history took elaborate steps to stymie the inevitable law enforcement investigation, according to federal court documents unsealed.
The wounded were rushed to safety using office chairs, wheelbarrows, or were simply slung over people's shoulders as the chaos unfolded.
President Trump has given an address to the nation following the attack, calling it 'an act of pure evil'.'Scripture teaches us, "The Lord is close to the brokenhearted and saves those who are crushed in spirit,"' Trump said.