If there were three officers inside this one-story building - that maybe didn’t have an attic or ceiling separating the roof from the main room - wouldn’t they have heard someone crawling around on the roof? There’s an insulated crawl space between my one-level house and the roof, and I can hear crows when they are walking around on the roof.
“wouldn’t they have heard someone crawling around on the roof?”
No, they were listening to Bruce Springsteen’s “Wrecking Ball” album on their USSS ear pods.