The logs have been missing all the time you owned it? Do you have the FAA records of ownership and maintenance that you can get on CD, that will show some history. ADs are a non issue since each annual should have taken care of any that are due or recorded any that will be due. Damage that can't be spotted on a prebuy is irrelevant in my view. I wouldn't panic over this, a good plane will sell for a good price. The logs you have on the plane should show all the extensive work that was done while under your management. Missing logs are a lever the buyer might try to use to lower price but until it has been on the market for a long while I would not let that influence me on price, if they need a loan for a 150 they shouldn't be in aviation yet. Alan's .02