Right there with you, every time I find something else to freak out about it's like oh my God why did I even start with rabbits? I thought quail were bad!
I find those periodically, it looks like it just got stepped on, AFAIK coecotropes look more like a little group of poop grapes, smaller, very soft and sticky. This looks formed then squished, or just a bit soft. If I find anything questionable I pull out the poop tray to examine for normal poop and also anything that looks like mucous or diarrhea.
I'm hoping somebody else who is a pro will weigh in!