I've never seen anything like this come out of a rocketblower. Was this the Giottos brand? If so, you should contact them and send the image. Who knows, maybe they will replace it for you.
The info on the right in the link is for Giottos parts, service, and repair:
About HP Marketing Corp
I got a reply back saying that they had taken a blower apart and didn't find anything in it like that and I had done the correct thing by removing it, said my blower would be fine.