I had this with the rear caliper bolts on my 2002 Boxster S
The bolt did come out eventually (with a lot of force) but the bolt was useless afterwards - you could see what corrosion had done to the end that was exposed to the elements for 10 years. Then, winding that through the hub carrier did quite a bit of damage to the threads.
However, I managed to get new bolts back in without too much fuss (basically cutting a new thread to a certain extent) and they torqued up well.
Definitely get new bolts.
James
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