It's none of you lot above, well not in my case anyway! If you look at my birthday cards, you can easily work out who didn't send me any cards, but I don't know about the previous birthdays on the list. I think that Little Jan probably knows who the 'culprits' are, but is too polite to name and shame.
To be honest, I would have understood 100% if Jane and Suban hadn't sent any cards, and I was VERY touched that they had in difficult circumstances. I don't think a polite PM is too much to ask either, but I haven't heard anything from the no-shows (Joanne I know has left, but the other two, zilch).