Thanks for the link Pamela! It wasn't until I got home that I realised the tray had ever been discussed, but with so much work to do I have been much quieter on GMB, so it must have slipped past me.
However, I do notice a slight difference between the pink and clear pressings: the pink tray has a diamond texture around the elephant's head, whereas the clear tray is almost smooth (a very slight rippling, but no diamond texture). Considering the rarity of the tray, I am surprised there were two dissimilar moulds - if not more?