As is noted in the article that Another Scott pointed to, we know how it was created. There is no mystery.
All significant features and misfeatures of the shroud can be explained by creating it with a rubbing technique on a bas relief model. It is a well-known technique, and most of us have used a variation to create a drawing of a coin or of bark using paper and pencil. This technique explains the 3-dimensionality, the realism, the vertical distortions in the image, etc.
So we have here a dated artifact, produced using known pigments, using a known artistic technique during a time when many, many fake religious artifacts were produced. There is no evidence of authenticity. It does not have blood on it. Etc, etc, etc.
At this point the only mystery about the Shroud is why so many people (apparently including boxley) continue to believe that there is actually something special about it! The only explanation that makes sense to me is willful ignorance (willful because it takes very little effort to become educated on the topic), and so it is more properly a question of psychology at this time than science.
Regards,
Ben