You can't tell what "type" of GTP it is unless you are there to catch it at that location. Everything else is just a best guess. Even those that work with them for a long time won't put a locale on them without paper work. If you got it at a pet store, its probably a farm bred animal which would be a mixed locale.
I also would caution you on handling at this age. The spines are fragile and you could damge it and not know until its an adult.