No, actually, it's good you didn't. If you had, that would have been a lot more suspicious.

I was very careful to cover my tracks when I made the coin. He shouldn't be able to get anything like a wand identification off it. When I made my naff little elephant I left the identifying markers in place.

I'll definitely try your excuse if Dolohov gets suspicious enough to look at the elephant. I mean, that I thought he might want the identifying information intact. (Because Dolohov knows I know how to hide it.)