I have actually made myself a list of interesting things I have collected from the hatbots for 1.33 ref:
-Strange Blood Banker
-Strange Boston Boom-Bringer
-Level 3 Chin
-Triggerman's Tacticals x2
-Haunted Crone's Dome
-Black El Jefe
-Genuine Quadwrangler
-Law x2
-Merc's Mohawk
-Chronomancer
-Graybanns x2
-Flapjack
-Lunatic's Leathers
-Vintage Officer's Ushanka
-Vintage Heavy Duty Rag
-Vintage Ze Goggles
-Angel of Death
-Gold Backwards Ballcap
-Killer Exclusive
-Brawling Buccaneer, etc, etc, etc...
Plus a bunch more I probably forgot about. I fancy myself one lucky mofo. Although I did just try to pick up a Merc's Mohawk and found out it was banking for 5.33 ref instead, and I now worry these days are no more...
