I've only had one o two floaters in Sentau sets ever, and like Cofee, one of them was an m-lock. I believe it was the second Clannad set.
But I've actually got them in several of my Funi sets. Thei thin packs usually aren't too bad, but the other two disc boxes are garbage. They have lousy hubs and they put both discs on one side. I had to exchange Big Windup Part 1 twice because both discs came loose and were badlty scratched. My Romeo x Juliet collection 1 actually had both discs loose and one actually fell on the floo, despite being a thin pack.
Maybe someone at the post office just hates you Pup. I can see it now; a disgruntled postal worker violently shaking everyone of your packages.