The mandolin carries serial number 125 and has a dark brown finish. Matt says it was taken in its yellow, rectangular case. The few pictures we could obtain are below.
The band is offering a reward for their return, no questions asked. They expect that the mandolin and fiddle are probably being offered for sale together.
You can contact Thompson by email or phone (651-276-7778) with any information you may have.
UPDATE 1/16: Wonderful news. Matt’s mandolin has been returned to him. Someone who bought it on the street contacted the band, and the mandolin is reunited with its owner.