Do you see any tiny staple marks on the inside panel? They don't usually putty them, so you should be able to see them.
If you don't see any, then maybe the outside panel was added last. It was probably stapled, too, but the staples may be covered with trim.
In my experience, those panels are very brittle and will easily break, when prying on them. ALJO may have the best idea. Cut your own access hole on the inside, add trim to the piece you cut out and hold it back in place with small screws. You might need to get back in again, anyway.
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