Conway said Reilly and Morrison told him that they did not attend the open house, but overheard the meeting from outside the room. According to WFPL, the door leading to the room where the meeting was held has a vent at the bottom and a large gap underneath, which is presumably how Reilly and Morrison recorded the meeting.
"They were in the hallway after the, I guess after the celebration and hoopla ended, apparently these people broke for lunch and had a strategy meeting, which is, in every campaign I've been affiliated with, makes perfect sense, Conway told WFPL. One of them held the elevator, the other one did the recording and they left. That was what they told to me from them directly."
Conway continued, "Apparently the gentlemen overheard the conversation and decided to record it with a phone or recording device they had in their pocket. Could've been an iPhone, could've been a Flip camera or something like that."