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Originally posted by: UncleBob
I'm glad they didn't... It'd be a pain to collect them all then. And when the next letter gets sent out, some of us unlucky fools would probably get the same item again and again. 
Not necessarily.
When I was making Snowmen, I noticed that I wouldn't get repeats until I got them all, despite the fact that my brother made a couple and I bought a Snowman item from someone else. Perhaps it uses the catalogue to track what you have or don't have to prevent doubles until you had them all if they wanted to.
Sure, this particular item isn't in the catalogue, but it be just as easy to track.