Has he still been in isolation? Also you said the vet wanted to do a fecal exam last fall, did they look for crypto or just hookworms? Crypto is a different test and even then false negatives are possible since it only shows up if the critter is actively shedding the parasite.
Run your hands along his mid-body. One of the last symptoms of crypto to show up is mid-body thickening. You might feel it before you can see it.
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