Finders Keepers — Patrick C. Greene

Within just a few hours of meeting her, Vic convinced sweet young Allison to go along on a robbery--and now they're on the run, stopping to rest in an out of the way fleabag motel. The initial rush is gone, and Allison is terrified, as Vic's behavior becomes increasingly psychotic. A battered old suitcase sitting in a dark corner of the closet holds what may be Allison's last chance--or a fate far worse.

A short story. Not for the faint of heart.
“That could be bad, Beau. That means somebody'd come back for it.”
”Fuck ‘em. Finders keepers.”