From what it looks like there were two different base options and you got the other one and quite possibly they just didn't put the tear drop on that base.. I will try and see if I can come up with anything(edit that is the 08/09 model)the tear drop came out in 09/10, hope this helps..
Construction seems fine. And yes metal edges. heavy scuffing on tip of the top sheet (this is a used board)
I get that bases are different so they dont waste any base material, but i thought the edges should be the same.