Bring your ownership paperwork.
I found this recent update to the law in another forum, looks like you will be alright.
PDF:
http://www.michigan.gov/documents/msp/MSP_Legal_Update_No._71_263341_7.pdf
First found in this thread:
http://opencarry.mywowbb.com/view_topic.php?id=20705&forum_id=30&jump_to=454766