Well.. as for ow it looks like you are SOL.
It is against UPS regulations to ship snakes, so no recourse there either.
Your best course at this point is refund or ship the trade animal(s) back, but use a service other than UPS.
My guess is that you did not mark the box for live animals (UPS will sometimes deliver certain animals, but typically, no snakes) which means that you would have no recourse from any shipping service due to a mislabled package.
Can't really blame them for taping the holes either.. they don't want to blamed for any damages that occur and the holes probably looked like shipping damage to someone there.