M.R.
I almost didn't want to read the question.....because I am sooooo guilty of not writing thank you's...It's just terrible. I know it. I want to. I even buy nice thank you cards....but I just don't find the time or the discipline to sit down and actually put it all together....
Sorry I don't have a helpful solution or answer, b/c it's an annoying life long habit myself. And I know i have royally ticked some family members off by not putting a thank you in the mail for them. But maybe you can get confirmation from him, being as you are the wife and you can tell all that he loved the 'so and so'....and Thank you so much for remembering him :)