"Select Similar Geometry" Blender addon

This simple addon lets you select object with similar vertex positions. As usual with Blender remember to have your transforms applied!
I think theres no way to do this in Blender, you can only select similar by material, linked, etc. but when you have a file with thousand of objects created outside Blender this really is a life saver.
It just has a threshold slider for the how much similarity it can search amongst the objects of the scene.
Use: just press Shift+Control+S