Do you have any evidence whatsoever that the adhesive matter is not as described?
On 11/23/63 the FBI lab examined the rifle closely and found no prints on the rifle. They also do not mention finding any adhesive matter.
Only after the rifle was returned to the DPD and Oswald was killed did Day produce the index card.
Can you rule out that after it's return, the rifle wasn't used to create the index card?