Same thing happened to me, i put in a ticket & was told that i had received them......I HADN'T!!
And i can't do anything else about it....Pffft!!
It was checked at what rank you were when the level of the great building was finished, and what reward came with that - and then if the reward was actually added to your account (I checked once more, and yes, according to our logs the reward was added indeed).
In general, where the confusion often lies, is with duplicate blueprints (sometimes hard to tell which one(s) you got extra), or just as often, with the rank you held when the level was finished. It does happen that you think you'll be, let's say, number one, and then at the very last moment someone adds just enough forgepoints to pass you and you end up on place two, or even lower.