New Post: When should Retweeted and RetweetCount be set

When monitoring tweets in the debugger, captured in a FilteredStream, I can see tweets which are retweets (evidenced by having RetweetedTweet set to the original Tweet), but yet the .Retweeted property is false, and the RetweetedCount property is 0.

When should I expect these to be set, is not in the context of a retweeted tweet.

Thanks