For those who are not famlliar with pipe restoratiion read the maintenance thread on this site or check out Dad's Pipes or Reborn Pipes sites and look at the vast amount of work that goes in to cleaning, repairing and restoring the pipes. Look at the before and after pictures. There is a vast amount of information available on how it is done and it will help prevent damage to your own pipes by educating you on what can go wrong and how to correct it if you do accidentally damage a pipe. The more you know the better you will be.
I have purchased three 'estate' pipes, one was a Butz-Choquin calabash that had been cleaned by the seller. I then thoroughly cleaned the pipe myself, did a 24 hour alcohol and salt bath, alcohol cleaned the stem then polished it. Then let it dry ---- all before ever putting it in my mouth. The second was unsmoked and just needed a wipe down and the third I received in trade from my brother and I had to alcohol and salt clean it twice ,,, not because I was worried about germs but because he had smoked Balkan Sobranie in it for 30 years !!

Learning about cleaning and restoration helped me get those pipes to a point where I was comfortable using them. I'm not advocating anyone do anything they are not comfortable with but rather understanding that this is a huge segment of the pipe smoking hobby.