The strongest evidence that John O'Keefe was inside Brian Albert's house is his Apple Health data showing him ascending and descending 3 flights of stairs between 12:21-12:24. Nicholas Guarino testified that John's iPhone was tricked into believing he was climbing stairs because the road he was on in Canton had a 50 foot drop. We recreated John and Karen's right that night with multiple iPhones to see if they would also be tricked. Not only did none of them record a flight of stairs being ascended, but Oakdlae Street was arguably the flattest part of the journey:
https://tbdailynews.com/canton-coverup-part-365-iphone-test-shows-nicholas-guarino-lied-about-50-foot-drop-on-oakdale-street-that-made-it-seem-like-john-okeefe-was-ascending-stairs-at-1222/