This would be better served in the Michigan forums. While I can not answer your question, I can ask you one that one that may help answer it.
Does your boss allow you to carry? Do you have the owner's express written consent?
Again, I don't know the answer to your question, but it would seem to me that, if at all possible, to legal CC at your place of work without a license you would need express written consent from the owner.
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