Court documents released Thursday give the first look inside the Lanza home.
Investigators collected a host of evidence.
One of the most alarming discoveries was Exhibit 608; three photographs with images of what appears to be a deceased human covered with plastic and what appears to be blood.
The document doesn't say who that person could be.
Agents also found a folder titled "guns" with receipts for gun related sales including a purchase made at Tin Star Shooting Range in Weatherford.
It doesn't say what the item was but includes an NRA certificate listed for Nancy Lanza.
Residents were surprised to learn the Oklahoma connection to the Sandy Hook mass shooting.
"Well its amazing to me that they were purchased here but it shows what a small world we all live in and how connected everyone is," Kristin Poisson said.
The search warrant doesn't say if the purchase was made inside the store or if it was made online.
"First I like to condemn what he did, what Adam Lanza, but also to say that we support the Second Amendment and we support the right of our local businesses to sell," Mayor Mike Brown said .
He knows the owners of Tin Star and said he feels secure in whatever transaction was made.
"I'm sure the owners out there did follow our rules," he said. They are good business people and good people in general and I wouldn't suspect that they did anything wrong there."
Investigators gathered other items they said they believe will shed light on Adam Lanza's state of mind.
Newspaper clippings, personal notes, memoirs and drawings will be used to develop a psychological profile of him, the documents stated.
Investigators also found other items likely belonging to Nancy, including books dealing with children suffering from Asperger's and autism.
We spoke with the store owner and they declined to comment on this story.
They did say they read the search warrant and did not have any recollection of the deceased suspect or his mother making that purchase.