I found a 21 year old cache today. Nothing like reading original logs written in 2002!
This cache was placed on November 29, 2002. After finding it lying out in the open, I was amazed to discover the original log book still intact, with entries dating back to the FTF (names redacted for privacy):
Yeah, I was pretty surprised myself... this was near a camping ground too, so a pretty frequented place. I suppose it might have just been re-hidden badly by a recent finder