Yes, the chest is empty…

…but for a “framed newspaper?”  Because that’s what you did with newspapers back in the day, right?

The robbers all escaped…

… until they didn’t, or at least two didn’t escape… because they were shot.  But given the age of the “Bearded Stranger” then, and Doc now, I am guessing he is dead.  So tell us Mark, tell us what you “understand” now…