My understanding of the "wiping" is that it had more to do with the special light used during the autopsy that showed - what they first thought was - semen, but what later turned out to be a wiping or cleaning up of the (right???) thigh. I did not think it had to do with the fibers. Isn't that more of a result of an evolution of theory - tying together the suspicion of wiping (seen under the light) and the appearance of fibers in the underpants.

I think Maikai has hit on the more likely source of the black/dark fibers. JonBenét was wearing black velvet pants. I think the BPD knows it and that is why they will not show the "report". It probably identifies the fiber as "cotton or velvet", not wool. I really do believe they have been bluffing - mainly because they have NO REASON not to show John, Patsy, or Lin the "report". It is not like they are "protecting the case" since they have completely tipped their hand on that issue.