I read from a site that Boxing Day storm 2010 was a Miller A. Not quite sure of it's accuracy though, because I did see portions of a video from YT that mention the surface low never really went in the GOM and just developed off the coast. I always assumed that there needed to be GOM interaction.
Miller B storms are easy peasy to recognize because the primary low/clipper travels through Midwest and eventually dies and redevelops off the coast.
If you find the time go and take a look at some of the surface maps from January 96 and check out the isobars/wind field. Just amazing.