Lost Time

While driving on I-81, Bryan Fleming spaces out somewhere in the vicinity of Syracuse, New York and loses over ninety minutes of time. When he comes to, he realizes he's missed his planned exit, and has no recollection of the lost time. After doubling back, he discovers a mysterious gym bag in the backseat of his truck while filling his gas tank. Upon opening the strange bag, Bryan spills out of his truck onto the hardtop near the fuel pumps. Inside the bag is a bloody knife, a bloody pair of rubber gloves and five thousand dollars.  
What would you do? Call the cops? Keep the money?