Just when I needed it most you sneaked an envelope with a few dollars onto my desk this morning. And you did the same for another needy friend. I'm sure that that person also appreciates it as much as I do. It could not have come at a more convenient time. Many thanks.
You're probably wondering how I know it's you. You always do good without wanting to take credit for it. You always give even though it's your last. That makes your gesture worth even more than the amount you give and made me think twice about how I'm going to spend it. Today I will not pass that homeless guy without giving him part of what you gave me.
I thought I should pass you this note just to express my appreciation not only for your gift but also for being the nicest guy in the office. You might not always know it but we all respect you.
And if you're wondering whom of the persons you gave gifts to wrote this, well, consider it from all of us because we all think you're a great person. I hope you have a really happy day.