Ordered new crank seals for a 1969 9.5 HP from a site highly recommended here on I-Boats. this is what they sent. To me they look used? they were packed in the tan envelope with the part# as shown. My question when ordering parts for these older motors is it normal practice to receive used parts? I understand NOS is old but has never been used. I ran a small piece of paper towel around the inside of seals and it came out black looking. would you folks in the know proceed with build or look for a better set? 