On the surface this just sounds like a run of bad luck. I read back through this twice, and please correct me where I'm wrong, but it seems that other than your Corn that passed in August (and seems unrelated), you've lost one adult BP and several Juvies that you hatched yourself. With out any further info, I just don't see how these deaths are connected.
Juvies can be an iffy proposition, and a run of bad luck like this isn't unheard of. You clearly documented the struggles of the snakes that were not thriving. Setting the Juvies aside for a second, that leaves your Het Pied male. He could have expired from any number of reasons, and with out a necropsy it's impossible to rule out certain things like a physical structural defect or some type of catastophic internal problem. Seems unlikely he would have died from either parasites or disese that quickly with no other visible signs of distress. I understand your position on having a necropsy done, and at this point I would not either if I were in your shoes.
As hard as it is on you, I think your decision to put your collection on lock down is prudent, if nothing else so you can observe your animals without extra stimuli that might cloud the matter. Again, on the surface, this looks like a run of bad luck. Careful observation should help you decide if this is the case or not.
Good Luck!
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