Woah. I have not followed nor heard much about Small Arms Review, Long Mountain Outfitters OR Dan Shea in many years. Are any of those entities still present and viable?
I am suspecting that Dan was untrusted with a large reference library of images ( and sadly appears like they were originals or one offs) and have now come up missing. That is a HUGE disconnect as all publishers should be treating that sort of material with respect and accountability.
Sounds like that is another story all by itself. Sad to hear if that is what transpired??