Thanks for the advice dabo and tribephyl I wonder if CBS has always uploaded ALL of the thumbnail images for an episode (both PRE-show and POST-show) at the same time and assumed people would not be able to find the non-linked POST-show thumbnail images in the directory
images/photos/thumbnail/{YYYY}/{MM}/{DD}/
since the file names had non-sequential numbering before (looks like a digital camera file name/number)
My Brother’s Keeper
103342_D38988b.jpg
103342_D40680b.jpg
Now they are using sequential numbers like:
S27_Ep{nn}_SG_{nnn}.JPG
Which makes searching for them trivial