OK, after you've cleaned out everywhere including under the seats in the station wagon, when you've gone through the OKC Second Time Around, Bricktown and Skirvin research boxes (and boxes for two future books), you end up with just two options left - hiring a PI or groveling to the wife to help in the search.
I love my wife.
The official corporate seal for Neal Horton's Warehouse Development Co. has been located. I will be stamping the seal into books at Thursday night's signing as mentioned by Chad. This will be the only opportunity where books will be sold with the seal added.