It is had to say anything of value with out more information but if they showed no outward signs of illness I'd look toward poisoning. My thought would be a hurried cleaning with bleach and not washing it out fully. I have seen snakes left with very very poor husbandry and survive ages with out heat or clean conditions so I'd think that is not likely.
I am sorry for you loss and I can just imagine how difficult being so far away and having something like this happen. I hope it is some unfortunate mistake and not a truely nasty disease that will place your remaining animals in harm too.
best of luck. Alex
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