It’s hard to be completely accurate with an answer through reading. The poop (as well as the urine portion) can change with diet, stress, and other factors when a bird is not necessarily ill.
We then look for other signs, such as activity level and how they’re holding the body and feathers. But keep in mind too, that if this bird is used to familiar surroundings somewhere else, and was brought to the mountain house, he could just be not acting himself because the surroundings are unfamiliar.
Sometimes when a budgie is starting a molt or just about to, the poop can change a bit, and they can seem not quite themselves, and a bit more puffy at times.
*At Talk Budgies, we always encourage the budgie owner to join the community, instead of going through someone else. Ask your friend if she’s interested in joining
Some pics might help us determine if the budgie truly looks ill. If he’s eating normally, that’s a good sign, and points to “probably” he is okay.
Additionally, you can always call the vet and ask if it seems you should bring him in (but keep in mind there, they will usually say “yes” regardless).