The "mites" banana I left notes about last night and today they've started to come to the consensus between me, and my two managers that know snakes better, that he's healthy minus the being skinny. Always feel free to tell a manager if there's something wrong and cruel. I go to them when I see something off and they always say or do something about it. When you have a big chain store it's not likely you'll have experts or professionals as managers or employees. My co workers are pre-vet, I'm just a meds student who reads a lot about animals haha. The managers are no experts either. Offer your opinions. Usually the snakes are healthy, they're just skinny because they're all fed once every seven days a meal that's too small. If you get them home and fed right, I bet they'll be just fine. None of the animals are in ideal situations, but a pet store doesn't have the time or resources to make it all perfect. The animals there are meant to stay very temporarily. And the normals fly off the shelves, the $119 pastels and very beautiful "fancy" balls do occasionally too.
Its the $350 ones that get stuck there way way too long. Then sickness can follow.
In conclusion: Always feel free to offer an opinion, they should be open to learn. If you come to us saying you're concerned about the wellbeing of an animal because x y and z, you should be heard. Just understand there are things we have NO control over.