Hi @funk8nguy. Great question. It's never too late for kindness.
You'll notice that I moved your message to this existing discussion called "Writing to Your Donor's Family." In addition to the replies you've aleady gotton from @rwalkie@corn50 and @jodeej, you can click VIEW & REPLY to review comments made from other members too.
@funk8nguy It is never too late, and I'll wager recipients are grateful everyday. My husband received a kidney Oct 2016 and we often speak of his "present to be present". We crafted a letter and sent it through the channels, but never heard back. As others have mentioned, showing gratitude is timeless, and he focused on what he is now able to continue doing. While mourning the loss of a loved one, the gifting of a chance to live cannot be underplayed. Simple appreciation is heartfelt.