If you can clearly see the contrast in the pattern the barrels have most assuredly have been rust blued. Hot bluing will normally provide a uniform black color or a very faint Damascus pattern may be evident.
What do the inside of the barrels look like? If they aren't pitted, the ribs are tight and have been blessed by a competent gunsmith familiar with classic doubles the barrels are quite useable with low to medium chamber pressure ammunition such as that sold by RST.
I really don't understand what you mean by the "wrapped in cellophane" comment.
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