The guitar, worth about $3,000, was returned to staff at WLUP 97.9 FM in Chicago late last week, the Post-Tribune of Merrillville reported Tuesday.
The red-and-white Holden (search) six-string electric guitar with a picture of a skull wearing a top hat was taken Nov. 12 after a concert at a bar in South Haven.
Someone anonymously delivered the guitar to a Chicago nightclub where the radio station was to host a promotional event last Thursday, according to WLUP's Web site.
The guitar was taken to the station's studios, where managers were arranging its return to Michaels.
After the Indiana concert, a photo of Michaels with the guitar was posted on the 41-year-old singer's Web site with the message: "We are asking anyone and everyone who may know where it is to please return it to us. This guitar has a lot of sentimental value to Bret and we just want to get it back."