A sad thing happened when I was searching last week:
July 15 for the bottom one and July 17 for the one on top.
And what is the significance of these two?
Nothing at all for Barney was listed on July 16. In the four years that I've been collecting his cards, that is the first time I can remember that an entire day was devoid of Darwin.
Listings have picked up since then, but I think there will be more days coming without anything new being posted.