Brooks Saddle with Thompson Post (Parts Theft)

What happened

Bike was locked up with U-lock outside of Columbia College Chicago. Bike was fine, but seat and seatpost (and attached tool bag) were stolen. No quick-release, but secured via a standard allen screw. Another student's bike was stolen at the same time, had only been locked up since 3:45pm, so about a two hour window. Combo for lock on toolbag is 0152.

Bike details

Type
Other (describe in detail below)
Color
Brown leather, black post
Condition
Some scuffs on the leather but pretty new. Tool bag with small combo lock hanging from the back. Gaffers tape wrapped around the seatpost.

Theft circumstances

Date
Sep 16, 2014
Lock type
Other
Locked to
Locked to bike rack.
How locked
Locked through front wheel and frame to object.
How defeated
Other situation, please describe below.
Duration
6 hours
Area
Sidewalk in front of an open business.