Michigan (and 5 other states) will have to deal with their own members. Some representatives have already been referred to their state Attorneys General for prosecution.
However, it is a federal crime to submit forged election documents to the National Archives. (double trouble if the forged documents contained the State seal as with the Arizona documents. Michigan documents did not.)
And, in Arizona's case, they have already been traced to a citizen group called "AZ Protect the Vote" and the decision to send the forged documents to the National Archives was spearheaded by Rudy Giuliani, according to the group's leader Lori Osiecki.
It won't be hard to extrapolate influence by Rudy Giuliani to the other five states.
Standing alone, some of this may not seem important enough to garner action. But as part of a larger criminal scheme, it's an important cog in the overall criminal activity.