The place COULD have simply had a bad week, we have all had them. Various things going on and next thing the cages haven't been cleaned and the staff is a bit harried. I know of a few places that think that more than one snake in an enclosure is okay( I do prefer mine to be seperate after reading here) but if they have never had a problem and have had mulitple snakes in enclosures for years, then it is very difficult to try to convince them otherwise.
If you get a chance to go back and check the cleanlness of the place a second time it would be quite usefull.
Some thing, like uniforms not being clean is easily explained, my own grooming tunic gets quite filthy some day, despite it getting washed every afternoon. Regular habits as in keeping numbers of snakes in an enclusure, or keeping large boids in smaller cages may simply be what they feel is fine.
Other things like dirty cages and snakes that should shed out fully having retained shed a lot, might not be so easily explained. I abhore someone who doesn't keep their cages clean for any animal, especially when it is in the public eye. But of course an occasional poo or shed is inevitable but you indicated much more dirt than that.
It may be explained or not, but a second inspection would be helpful if you have the chance again.
I also do not allow just anyone in the back sections of my rooms, nor do I allow people to simply walk in and see where I keep my snakes.
I would like to comment on Adam's balls however. Having held a pair of them, I find them quite beautiful, soft-skinned and active, while showing a bit of spirit. Hey... the het albino pair I purchased!! You sickos!! heeheehee. sorry Adam couldn't resist.
Wolfy