As far as the logs go. I'm still undecided as to whether it's a walking issue or a negotiation issue. I do agree they are very important. And of course a plane with full logs is always preferable.
If I remember correctly, when a U.S. plane is registered in Canada it receives a brand new set of logbooks and, in effect, the original logs are 'thrown away'.
The unscrupulous dealers can use this to their advantage, effectively hiding previous damage history and presenting an airplane with a legally 'complete' set of logbooks.