Hehe - that's a pretty definite test, for sure.
And, well, I couldn't resist
I cut out a small piece of the inside material - from behind the 'flap' left bottom, so it's not noticeable. Before, I was 99% sure the inside material was imitated leather - now I'm 100% sure. It's a thin layer of some foamy material with a woven backing. I've attached some photographic evidence.
And then I burned the little bit, just because. I know how synthetic fibres burn, so I was curious. It burned quickly and easily, but results are inconclusive though, as I don't have any real leather samples to test against.