Could be either or but you can never base it on what you've seen, because there's plenty we haven't seen. For example I have introduced two new early 3rd Guards types in the last year that no one seems to have seen, or is in any books, but they will be now. And as you know the 3rd Scot Guards is a very famous unit... and if they could go under the radar until 2011 I think just about anything is possible. I almost had the hat trick but the 3rd type was discovered within the last few years.
PS: Two of the three were pewter and had only been known in brass before.