Obviously you recognize that the statement above is nothing but here say ...... And you have clearly avoided the the biggest flaw in the tale....The fact that the clip board wasn't found until days after the assassination. No..... On the second thought the biggest flaw is the fact that the clip board means absolutely NOTHING!.. It merely means that Frankie Kaiser's clip board was discovered on the sixth floor ...... Beyond that, it an indication of NOTHING.
How is it hearsay when the witness had direct knowledge of the facts that he described? LOL. Kaiser confirmed he made this clipboard.
He could identify it as the one he made, in part, because his name was on it. He knew that Oswald used this clipboard. Why does it matter when it was found? But if it does for some reason, maybe note that access to the building was restricted for some period of time after the assassination. Kaiser was the only person in a position to link Oswald to the clipboard because he had direct knowledge of Oswald having used it.
Kaiser's testimony does a lot more than confirm that "his" clipboard was on the 6th floor. Kaiser confirms that Oswald was using this specific clipboard. That clipboard contained invoices for 11.22. Kaiser was not even at work on that day. A simple matter to connect the dots. This does not require a Ouija board.