I think you mean the ability to fabricate a story that the card was sent to the FBI at midnight 11/22/63.
Huh?? You think I mean?..... Have I not been perfectly clear? There is an evidence inventory list for the evidence that was turned over to FBI agent Vince Drain at midnight 11 /22/63. ( You won't find this list in the Warren Commission documents because the conspirators did not want us to see that list.) But a copy of the evidence inventory was found by J. Gary Shaw in the files of the Texas Rangers, so thanks to Mr Shaw we can see with our own eyes the list of evidence that FBI agent, Drain received at midnight 11 / 22 /63. And the 3 X 5 card which had a 1 inch wide piece of cellophane tape stuck to it, was one of those items ( #14) on the list.
The reason the conspirators didn't want us pissants ( as LBJ called us) to see the original list is because it lists that 3 X 5 card and both the DPD and the FBI claimed that the so called "palm print" that Lt Day swore that he found on the bottom of the metal barrel of C2766 was not turned over to the FBI and Day had neglected to tell the FBI about his discovery of the palm print on the barrel. ( one of the key conspirators, Henry Wade, lied when he told reporters that Lee Harrrrrrvey Ossssswald's prints had been found on the rifle and there had been NO identifiable prints found on the rifle, so they were forced to bring the 3 x 5 card back to Dallas where they could fabricate the palm print evidence.
P.S.---- CE 1304 ( page 132 WR) is a photo of the disassembled Carcano ..... The photo clearly shows the bayonet lug that surrounds the barrel at the place that Lt Day swore that he found the palm print of Lee Oswald..... That bayonet lug proves that Day was a damned liar.