I wish I would have snagged a brick from old Comiskey. Friend of mine has a seat that I'm trying to snag from him for some trade work.
I think the coolest thing I have was a Spring Training program from 1972 (I believe) when the Sox played in Sarasota (Allen never showed up for ST unfortunately). They played the Phillies that day and my program was covered with autographs from all the Sox guys like Melton, Walt Williams, Carlos May, etc...and I got a couple Philly sigs too (Luzinski and Mike Schmidt). It's tucked away in a box at my Dad's. If anybody recalls the ST facility you pretty much hung out by the clubhouse that was separate and all the players had to walk thru to the field.