Windom Earle's briefcase.
Since BOB took Windom's soul and is also inside Mr. C, that's one reason why there's several Earle callbacks when it comes to the character.
Mr. C retrieved the briefcase when he went to the cabin and discovered Leo and the spiders.
#TwinPeaks
David Lynch's Worlds
#TwinPeaks s03e02 Part 2: The Stars Turn and a Time Presents Itself (may 21, 2017). Frame 53912
