I think there were a couple diferent kinds of orange fibers - but what you might be referring to is Shen descibing most of the fibers in question as bright orange - but she described the one found on the necklace as dull orange.
but she described the one found on the necklace as dull orange.Only when cataloguing evidence---before the fiber was cleaned. The fiber turned out to be the same bright orange as the others.
You are correct, there were a couple other orange fibers that did not match at other places--one was wool, I believe.