Hi,
a feature I really like to use because I like adding pictures is to search for "//no-picture//". That way, you can get every coin entry that has a missing picture in the Obverse or Reverse slot. Well, at least it should. As you can see, this coin has no pictures, but I can't see it when I search for "//no-picture//" in San Marino coins.
I noticed that the first time some time ago when I made a request to delete a coin picture because it was the wrong one. I think it was the case that when the coin entry once had a picture, it won't show up at the "//no-picture//" search ever again. At least that's what I observed. I couldn't test that again specifically and it also might not be the only scenario, but there definitely is a bug regarding that search.
Best,
Trooper.