A few other facts that contradict the idea that Oswald was the one who fired at Walker:
-- Dallas police officers Van Cleave and McElroy described a steel-jacketed 7.62 mm (30.06) bullet in their General Offense Report filed the same day of the attack. Oswald allegedly fired copper-jacketed 6.5 mm bullets at JFK. I've already mentioned that Walker himself insisted that the bullet entered into evidence was not the bullet that he saw retrieved at his house.
-- The $21.45 money order that Oswald allegedly mailed from Dallas to buy the rifle amazingly arrived at Klein's Sporting Goods in Chicago on March 13, less than 24 hours after it was sent from Dallas. The money order was then deposited in the First National Bank on the same day it arrived at Klein's, a remarkably rapid processing of a money order.
-- The 36-inch, 5.5 pound Mannlicher-Carcano carbine allegedly ordered by Oswald does not match the murder weapon entered into evidence by the Dallas police: a 40.2 inch, 7.5 pound Mannlicher-Carcano short rifle.
-- The WC was unable to find any evidence that Oswald picked up the alleged murder weapon at the post office in Dallas. Oswald was not listed on the p.o. box form as an authorized recipient. Postal regulations required that anyone picking up mail from the "Hidell" p.o. box be listed on the form as a recipient. Also, no postal worker at the post office recalled seeing Oswald pick up the weapon.