Does anyone know if purchase history goes back "forever"? If so, apparently I didn't buy a Steam game actually using the platform (i.e. after Half Life 2 installed it), until August 2008, more than 3.5 years later. I must've stuck to boxes (or dial up!) for longer than I thought.
Edit: Ah, of course. You have to go to the activations list to get boxed or 3rd-party purchases. So, I didn't purchase directly via Steam until August 2008, but over several years I bought physical boxes or keys that required Steam (listed as "Complimentary"). My first purchase directly through Steam was something called Bullet Candy? Must've been a drunk impulse buy.
13 Sep, 2008 Multiwinia + Darwinia Steam Store
9 Aug, 2008 Bullet Candy Steam Store
6 Oct, 2007 The Orange Box Complimentary
17 Aug, 2007 Bioshock Complimentary
10 Jul, 2007 Nexus - The Jupiter Incident Complimentary
24 Jun, 2007 Hitman Collection Complimentary
19 Jun, 2007 Free Race Caterham Expansion Complimentary
13 Apr, 2007 Race - The WTCC Game Complimentary
18 Feb, 2007 Jade Empire (ROW) Complimentary
4 Feb, 2007 FlatOut Complimentary
16 Jan, 2007 Psychonauts Complimentary
3 Dec, 2006 Dark Messiah of Might and Magic (WR) Complimentary
20 Sep, 2006 Defcon Complimentary
4 May, 2006 Half-Life 2: Episode One Complimentary
20 Apr, 2006 Sin Episode 1 Complimentary
19 Feb, 2006 Day of Defeat: Source Complimentary
17 Feb, 2006 Space Empires IV Deluxe Complimentary
17 Nov, 2004 Half-Life 2 Retail Collectors Complimentary