This is a bit of Workplace shell weirdness. I have a printers folder with 8 printer objects in it. The window is neatly sized to show all 8 printers in a 2 x 4 grid.
I created shadows of 4 of the printer objects on the desktop. So far, so good.
I then checked "Lock in place" for the 4 shadowed objects on the desktop. When I open the printers folder, all the icons are gone.
(After a little investigation, I see that if I make the printers folder very large, some of the printer show up. By very large, I mean bigger than the desktop.)