Dear Kicker,
As a former mailman, to me one of the important parts of your post is that you recognize that this is a special service and your carrier is not given more time allowance to get to your door, but you do acknowledge this. The cookies aren't necessary but I'm sure appreciated. Just a kind thank you occasionally. Some customers are pretty cantankerous, even when you give extra service. I had a few that had special service but only a couple who complained regardless of what I did. Thanks for expressing your gratitude, thank you.

pat e