By the time Oswald was under interrogation it had been pretty firmly established the shots had come from the SN at the TSBD.
This isn't a true statement...but even if it were....Simply because many folks believed that the shots had been fired from the sixth floor...DOES NOT prove that Lee Oswald knew that the sixth floor was being presented as the site where the shots had been fired from.
By 12:34 Dallas police had received statement shots came from TSBD
By 12:36 ?.by the 5th floor of TSBD
By 12:37 "Get some men up here to cover this school depository building. It's believed the shot came from, as you see it on Elm Street, it would be upper right hand corner, second window from the end."
"Can you give us any information as to what happened for these people out here, evidently they had - seriousness of it - the President involved - 1 is at Parkland, along with Dallas 1. We have word it is unknown - Texas Depository Store, corner of Elm and Field - officers are now surrounding and searching the building. (Garbled)"
By 12:45 "Attention Elm and Houston is reported to be an unknown white male, all squads. Attention all squads. The suspect in the shooting at approximately thirty, slender build, height five feet ten inches, weight one hundred sixty-five pounds, reported to be armed with what is thought to be a 30 caliber rifle..........He's thought to be in this Texas School Book Depository, here on the northwest corner of Elm and Houston."
By 12:47 "Signal 19, involving the President. Suspect: white male, thirty, slender build, five feet ten inches, one hundred sixty-five pounds, believed to have used 30 caliber rifle. Believed to be in the old School Book Depository, Elm and Houston, at this time."
By 1:12 three shell cases are found on 6th floor SN. Minutes later the 6.5 mm MC c2766 is found on the NW corner of the 6th floor.
Find for me anywhere else other than the TSBD that DPD was looking for JFK's shooter. You also just ignore Fritz questioning Oswald about his whereabouts when POTUS was shot during his first interrogation. This has already been covered in a previous post. Also, since Oswald WAS the shooter nobody needed to remind him of it.