You should definitely check the rotors. Rule of thumb is every other pad change. Pads go 35k mi. maybe, so at 70k mi. you're definitely due.
Or you can be precise and check them with a micrometer or a vernier caliper. For Boxster S, you have a minimum thickness of 22.6mm (0.89") Fr and 18.6mm (0.73") Rr.
Wearing the rotors below this minimum thickness will drastically reduce your braking efficiency and can cause a premature rebuild or replacement of the calipers.
Also, if sticking with the existing rotors, be sure to at least sand them down with #40 paper and a block. This will remove the previous pad material and allow a layer of fresh pad material to build-up on the rotor face - a necessity for reaching max braking efficiency.
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