engraving

In the messages to his roommate Robinson said the engravings were "mostly a big meme", indicating perhaps that they should not be taken as a serious statement.

Robinson goes on to fret about losing his grandfather’s rifle and describes the engravings on the shell casings found at the scene as “mostly a big meme.”

He added that the source and reasoning of the engraving on shell casings is still under investigation.

"The messages also refer to engraving bullets, and a mention of a scope and the rifle being unique," the affidavit states.

The engravings on Robinson’s bullet casings come across as a hodgepodge of messages that don’t fit together comfortably, Donovan said.