O'Brien was released from jail on December 14, 2018 after posting bond. The day after the fire subsided, fire marshals found a massive amount of weapons, locked safes and potential explosive devices in O'Brien's possession. The list of weapons found included 50 shotguns, 10 semi-automatic rifles (including a couple variants of AK-47s), two Uzi-style rifles and 20 handguns. Other materials found were a number of locked safes, two flamethrowers, thousands of rounds of ammunition that were stored in boxes, several other weapons with their parts and three skulls. One of the weapons was illegal to possess, a sawed-off shotgun (with an approx. 1" barrel.) The search warrant that was issued did not state if O'Brien had paperwork for his cache. However, the state of Florida does not require a permit to purchase or possess a firearm.