trunk lock

My trunk will not lock. Is there a trick to it other than just sticking the key in and turning? Is it possible I was only given a valet key? How do you tell if it is a valet key?

thanks,
87esir

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I believe I have probably found the problem. Either way this is a thread the everybody needs to read if they haven't already.
http://forums.bimmerforums.com/forum...ad.php?t=79896
If everyone is aware of this please forgive me, it's new to me.
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I checked my e36 that only has 114,000 miles and I had two wires that were completely broken open and wires showing.