That's just insane. If this was given out to members of the public (St Louis, or wherever) then it is in the public domain. They have no legal ownership of it as an item at all, it belongs to the person who it was given to.
It was a press kit for pity's sake!
I can understand them not pursuing every amiga pirated game (not their IP rights infringement), but I would think they would pursue copies of pirated OS disks just on the principle (I've seen a few 'pre-installed' hard disks going on ebay recently also).