various housing questions

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Hi,
After a crash screen accident, I bought a black housing for my G2 and I ran into different problems...:
-I gave the broken phone to a shop to replace the screen and gave them my black housing in order to replace the white one. They gave me back the phone. everything works, except gps: no detection. The shop told me it was due to my 'fake' housing but I suspect an antenna problem? how can I test that? someone could tell me where is that antenna?
-I've noticed that screws were missing inside the housing.... first I suspected an error from the shop... and I saw that in fact there was one screw broken in its place... I should replace them, but dont know which type of screw I have to buy (on the pic below, it corresponds to the red circles). And should I buy only the screw , or the screw and the small metallic part going with it (that is on the back side of the housing), and where to find this kind of screws...

Don't know it's really clear, but hope that someone could help me....
Thanks
JR

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