All Boxsters have a front and rear emergency release cables.
On 1997-2000 the trunk release levers in the door sill are mechanical levers. You do not need a battery to operate the mechanical levers. The issue is when the alarm is set the levers are locked so they can't be pulled up. If the battery then dies you can't lift the front trunk lever to get to the battery.
As long as you did not pull the battery while the alarm was set then you will have no problem opening the front trunk.
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