Got a reply from Dr. Briggs:

Of course I remember you & Marla :) ...and thank you so much for your kind words. I am truly sorry for your loss.....18 years is a reflection of your care & for that I commend you! Thank you also for your donation of food to those other needy cats that we see.
I'll be sure a paper note goes out in the mail to you this week-
CHeers-
DOcB