Return Gazlowe's Ledger to Gazlowe in Ratchet.
Everything looks square from my records, [player]. Go on back and tell Gazlowe he's out of luck. I wouldn't be surprised if it was the pirates that nabbed his goodies.
Nothing else I can do for him. Oh... though you could tell him that I've got some things from Undermine for him, when he has the time to come pick them up.