The number on your temporary is NOT the number you want to grind into your hull, it is a short and temporary number. The real number is much longer and is permanent, wait for your final documentation paperwork to come in. I compared the two numbers I got, the temp was 5 numbers long, the final is 7. Once your final paperwork is delivered, the number will never change again as long as the boat lives, or so I understand. If it was ever documented, the number is on record somewhere and shouldn't ever change. I imagine part of the process is them checking to see if any past documentation occurred, along with title search, etc...