The enclosures look good Manda! I'm glad they have both eaten. I don't remember if you said before, but do you have any local livestock/rural/horse type veterinarians that you know, that would maybe just do the fecal test for you?
Either way, it may just be stress and dehydration from the crappy care they got from shipping and being kept at petco. Now that they are eating a little and separated, you should be able to track the defecation a bit better. Don't you love taking about poo
And make sure you are washing your hands afterwards, just to male sure if they do have something you don't pass it to your chams.