Investigators are combing through dozens of electronics seized from Travis Reinking's home.
In addition to cell phones, hard drives and mini video cameras, detectives found more than 1,000 gun cartridges.
Detectives say Reinking also had scopes, cleaning rods and magazines.
The search warrant was executed at noon Sunday, nine hours after police say Reinking went on a murder rampage inside an Antioch Waffle House.
Inside Reinking's truck, investigators found a buck knife.
News 4 is also learning more about the surviving victims' injuries.
Police say James Shaw Jr. who wrestled Reinking to the ground was shot in the arm.
Sharita Henderson was shot in both legs.
Shantia Waggoner was shot in one leg.
Kayla Shaw had cuts to her face and arms from the glass window that was shot out.
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