Can you imagine - let's try for a second but just one - a defense lawyer stating in court that his client couldn't have shot the victim Smith because no box for the ammunition he used was found? Or that the police couldn't find where he purchased that ammunition?
A defense lawyer doesn’t have to demonstrate that his client couldn’t have shot the victim.
No box for the revolver bullets found on Oswald was discovered either. Nor did they find out where he purchased them. Does that mean the shells never existed?
No, but it does make you wonder why they weren’t “found on Oswald” until hours after his arrest and detainment.
Some people have an almost emotional need to exonerate Oswald.
Sadly, far too many don’t feel any need (emotional or otherwise) to actually demonstrate with facts and reliable evidence that Oswald did it.