User blog comment:Real Godisme/468: Star Memory/@comment-5266348-20160109210748

Lucy can't just destroy a key and get it back in a year. She would have to find it before anyone else interested in using it did to get it back. Logically the world is such a big place that Lucy could search for a lifetime and never find it. Of course this being manga means she could get it back, but the story isn't considering that.