https://captainstevens.com/military/...erret-numbers/
At link is a long-ish discussion of where Canadian Ferrets were marked and how. The anguish of sanding off the original number might have been misplaced. According to Colin, there is a double-sided plate over the driver's right shoulder with a hull number applied. This would resemble the British number often seen on the front over the driver's hatch.
You are hoping to find a number that resembles 54- 82500 through 82623. The site has some conversation how the hull number was misrepresented in official paperwork.