I have performed a clean install of Mavericks on a new empty hard drive. My old hard drive with two 10.6.8 Snow Leopard partitions is also still installed in my Mac Pro, because I am planning on manually moving stuff over. Heres the weird thing: In the Mavericks trash a bunch of files appeared that should not be there. They seem to be a subset of those in the trash of one of the Snow Leopard systems (the one that will remain in use for software compatibility reasons). How can this be and should I worry about it?