I have to chime in here.
I am in the midst of selling 37F "Putt Putt." If I took the smae approach these sellers did, I could say NDH. In fact, 37F did have a landing accident in the 1970's where a right wing was rebuilt, the prop was straightened. That was over 30 years ago and is documented and listed on the NTSB web site.
But I can't do that in good honesty and faith. I listed it as having damage.
Sunday morning I showed it to a prospective buyer - we discussed this very subject, along with other issues related to honesty. Face it - no matter how hard we try and no matter how much research we do, there is a certain amount of faith.
Personally I go with the honesty policy. I tell them what I know, and show them the 337 for the repairs.
