You can go into depression.
The best thing you can do is look around.
Yes depending on where you will be trading it in. Be prapared to reciave less money as a result of the missing pieces. A DS is worth about 30$ trade in value at Gamestop, however considering the missing piece you are likely to have a reduced value, all of this depends on where you go and how their trade in system works.
The missing kitten appears randomly after you've opened and closed the gate.
the ds will freeze
the last place a person left it
Your nose is missing
It will hurt!
you get another one if you can't find it or leave the DS as it is!
Nothing it will stay the same
You have to blow also the ds game slot in your ds
nothing
your eyelid can cave in