I don't know if this has been pointed out before, but eBay was only aquired by Paypal in October 2002, so as Priscellie points out in every post (I only noticed the sig, last week. Cool!!!), the earliest PG can be take place is July 2003.
Also, as previously shown, The latest Death Masks could have taken place was Feb. 2001. (TWA stopped flying in Dec. 2001)
Since (according to the second post in this thread) DM takes place 3 years before PG, we have seem to have two choices:
DM - Feb. 2000, PG - July 2003
DM - Feb. 2001, PG - July 2004
Hart.