This argument goes nowhere, the crime wasn't committed in some dark alley where a single identification may cause doubt, Oswald killed Tippit in broad daylight and was positively identified by multiple people.
Identified by "multiple people" who didn't even see a crime committed, in unfair lineups.
So they had the shells in custody but forgot to initial them, silly conspirators.
So you can't prove that they are the same shells then. Silly LNers.
I really don't get why you find this to be such a problem, he kept it on his person for safe keeping.
Of course he did.
What's the difference if he kept Oswald's revolver for 10 seconds, 10 minutes or 10 hours?
Oswald's revolver. LOL. How would anybody know that the gun that Hill pulled out of his pocket 2 hours later was even ever at the theater, much less ever even touched by Oswald?