The interesting origins of Thurn and Taxis, Pierce Inverarity...just a name?

When Pierce Inverarity dies Oepida Maas is made one of the co-executors for his estate. Inverarity seemed to dable in many things, mostly real estate but we also find that he was involved in the creation of charcoal filters for cigarettes made from human bones. I decided to see if I could find a definiton for inverarity, and with dictionary was only given a link to a website titled inverarity trees (which had something to do with family trees. I dunno .) So when I came to this end where else did I have to turn but Urban Dictionary.com where I found that the definition they had for inverarity was this, "a large rolly polly male who has so much wisdom many refer to him as the Buda (ouch, spelling that incorrectly is painful). It is rumored that he has jedi powers, the ability to bring down a fully grown dragon, and can eat all the food in a banquet meal for 602 people." Whoa! What a man! Jedi powers, really? If Pierce really had these abilities it's a shame he's dead, moving on.
So what does Inverarity have to do with all of this? Well when Oedipa leaves her husband behind to arrive in San Narcisico, California which may or may not mean "Without Narcisism" in Spanish, she happens across many facts about Pierce that she hadn't known, and might explain the call she received at 3 a.m. from him about a year from this point. That he was making her excutor of his will, he may have been involved in some bad dealings with a man named Tony Jaguar, he created cigarette filters from GI bones, and on top of all this, there is a nagging intuition in the back of Oedipa's mind that he is involved with Thurn and Taxis, a postal system in place before the government regulated USPS, and is still surviving nearly underground.
When I did a google search for Thurn and Taxis I came up with a board game which set in Bavaria has players establish mail routes. This game can be found for purchase at www.boardgamegeek.com and also includes a brief game description. There are also many youtube videos, unfortunately most of them are in German. One of which was called Museum of Idiots 8 -Thurn and Taxis and had a large oversized chicken in it, and another video which is basically a movie about the game. Even now, why can we not find direct information about the elusive postal system?