Here is what I found on the contractor's numbers!
This is off the states site!
Do contractors need to show their registration to their customers or display the registration in their business?
The law does not require contractors to show copies of their registration. After registering, a home improvement contractor registration certificate will be issued to the contractor. If contractors wish to display it, they may but they are not required to do so. However, contractors must include their registration number in their advertisements, contracts, estimates and proposals.
Do contractors need to display their registration number on their vehicles?
The law requires registration numbers in any advertisements used by contractors. If a contractor has an ad for their business on their vehicle, the ad must include their registration number. If the vehicle does not have advertising promoting the business, then the contractor is not required to display their registration number on the vehicle.