Im not a 100% of this but the boxster may not have come with the Automatic locking doors as you drive off... I do know that SmartTop modules that are installed to allow you to lower your convertible top while driving does have an add on feature which has a function to automatically lock the doors as you drive away.
Could be that either the module wasnt installed correctly, module defective, OEM lock button defective or that is as designed.
Pull off the button cover where the lock button is located and if your car does have the SmartTop module it'll be sitting right behind the cover. If theres nothing there, then its another issue like PCM failure to accept command for the unlock feature or one of the wires has gotten cut.
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