I would try to find a car with a full service history. And make sure that you find an indy with a good reputation before you buy a Porsche.
In the wider area around my hamlet are three indy Porsche workshops. And I know for a fact that two (and perhaps the third as well) will accompany the owner-to-be when it comes to inspecting and buying. There’s a price tag, but a small one compared to the troubles you can run into.