On 03-Aug-98 Perry E. Metzger spoke unto us all:
  
#  They aren't really "spool files" either. "spool" is really for things
#  like the mail queue, print queue, etc. Perhaps someone could suggest a
#  better directory for them? What are the auth files, precisely?

Auth files are these magical files used by the X server to do things like
MIT_MAGIC_COOKIE (wot a name) authorization.  Its the stuff that makes ssh's
automatic redirection, and xhost work.

I would suggest /var/db.. they are a mini database of sorts..

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Tim Rightnour    -  root@garbled.net
http://www.zynetwc.com/~garbled/garbled.html