WANTED. Need 2003 Boxster key with remote HELP.

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You don't need luck if you buy the right one

Porsche Boxster 2001 2004 and 996 Targa Key Remote | eBay

A used key won't work unless you have the code or matched immobilizer. You must buy a key (with code) and have the dealer program the car to accept it.
The key in the above link is what you need.