Bullets that were fired at the Presidential motorcade, including fragments of the fatal bullet, are maintained at the U.S. National Archives. Photographs of those evidentiary items have also been digitized and can be viewed on-line.
The window of President Kennedy's limo was cracked by the shooting. It was removed from the car, marked as Warren Commission Exhibit 351, and stored in a wooden crate. The cracked glass is very visible in the Archive's digitized, marked photograph of the physical evidence.
Those were not the only bullets Oswald allegedly fired the afternoon of November 22, 1963.