Thanks for the feedback on that 1961 Mooney. I spoke to the owner today, apparently there are two partners on the plane. One lost his medical, the other lost his job so it hasn't flown for a couple years and is well out of annual. He said the logbooks were ripped off when his truck was broken into, though they were able to find some records, primarily for the engine.
I chatted with an IA on the field about the cost to get it back in annual. He is going to give all the documentation a once over to see what the cost would be. I also just ordered the FAA records (337's, etc).
From talking to the owner, it seems it was taken care of pretty well up until the point they stopped flying. Fuel bladders were replaced, etc. After that, aside from some occasional taxiing around it has sat in a hanger.
Before making any real decisions, I'm going to see what the estimated cost is to get it back in annual, and have the IA give it a once over to see if there are major issues. Depending on what is found, this may either be a bad situation to run away from, or a good plane that I can get into for pretty reasonable cost.