Yep, I agree - if the main board isn't cracked in two (it looks like someone has driven over it - you can't bend 1mm stainless steel like that with human pressure alone) then make sure it's really dry and there are no loose bits of metal & try powering it up.

If you're at all nervous though, send it back in. As David says, we have spare metalwork and can rehouse it & sort most problems out short of a motherboard in pieces!

Hugo