What do those "blank" buttons do on console and left center dash (options)

[jnicholson30]

Hi All -- I've been looking at buying my first Boxster and in every one that I've seen there are "blank" buttons, where surely optional features might have been. There are two in the center console and a set along the left side of the center dash to the left of the radio.

I can't seem to find any info online about what these features might have been - are they features that people actually like/enjoy? I'm trying to figure out if I should hold out for a full featured 2001-ish low mileage one. Any advice would be appreciated! Thanks everyone.