Last year I did the Utah course and paid the Lake Powell tax.
I also did the AZ Boaters safety course.
On my last day I requested an inspection at the top of the Wahweap ramp.
I blew out the motor and the inspection was completed, Live well and wet anchor lines are topics.
They attached a wire tag to the boat at the winch point indicating a clean and dry boat.
I volunteered to show them my Utah Certificate and my Arizona Game and Fish Boaters certificate.
I was informed that theses items were not needed for their inspection.
I asked when these items might be needed and was informed that Utah game and fish may ask for them if they stop me on the water.
Still have not seen a "sticker".
Basically it's a wash, I don't have to buy a Lake Powell stamp to fish anymore.