Oswald purchased the rifle by mail.
I pulled the "JFK assassination" out of my *ss, since it's been done to death and would thus make clear that I was only positing hypotheticals.
My point is that, without additional context (like: "Oswald purchased the rifle by mail"), a perfectly true statement like "No receipt was found" can be very misleading.
A biased reporter hoping to inflame sentiments will therefore include some bit of data like "no DNA evidence at the crime scene," but then forego mentioning that tons of linking DNA evidence were found at the perp's residence for exactly that reason.
Regards,