Got this from another forumn:
250,000 vehicles were damaged by flood waters during Hurricane Sandy. Many of those vehicles are starting to turn up on the used car market. Unscrupulous dealers may not tell you that a vehicle has been damaged in this way.
The National Insurance Crime Bureau has a web site that can tell you if a vehicle has been part of an insurance claim. Anyone can check 5 VINs in a 24 hour period for free.