I love the fact that you are posting lost gear. But a demand for beer seems extraordinary. I'm all for a little reimbursement for getting gear back. What you are saying is more of a demand than a gesture of good will. I would understand if you were going out of your way and shipping / delivering the bag to it's owner. Thanks for posting and I hope that the owner reads this post, but getting good river karma from returning the gear is what it should be about.
Claimer: Someone that makes a claim that they have been there and done that, can do anything you can do better than you. I hate "claimers"