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fingerprints are very possible, however I'm not sure that it can be lifted with tape. After over 100 years or so, the oils from the fingerprints can alter the corrosion. I've seen this with firearms that haven't been cleaned regularly. I imagine it can happen the same way with brass casings.
As for burned in... I doubt it. Most firearms eject the spent cartridges and they aren't touched when hot.
Most firearms eject the spent cartridges and they aren't touched when hot.