Most pituophis are collected locally. They have the luxury or knowing where or when an animal was collected.

I'm guessing most monitors are collected by natives which bring them to a central collecting point and then to the shipper who splits them up to ship them to the states or Europe and I'll bet you can add a few intermediate steps along the way. At least that's my guess.

In that situation, unless you are dealing with a very restricted animal the chances of you knowing where it came from are pretty slim.
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Ed
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Trying to keep the fun in Chelonian care