Trash pile mystery

Everyone knows that that's the best kind of mystery.

Look—the tenth-floor trash pile, at work (yes, we recycle):



The mystery:



Huh?

WHAT is this for? Someone went to a lot of trouble with this, measuring, then cutting the holes exactly the same size (it seems?), then numbering them, first by twos, then by ones.



And who is this mysterious Edoardo Laudi?

I suspect this has something to do with art conservation . . . but what??!