In Wisconsin, each Seller is required to complete a document called a Real Estate Condition Report....(RECR in agent lingo) and it is basically a questionnaire asking about the "physical fitness" of the house...has there ever been an issue with.....the roof, foundation, electrical system, plumbing etc. IF there has been an issue how and when was it remedied. Common examples might be...during the storm in 2012...the power went out and there was some water in the basement because the sump pump was not functioning. The roof was replaced in 2015 due to age, etc.
When the Seller is not the first owner of the house...things may have happened or been done that were done or happened to a previous owner. Agents that do their homework....dig deeper into the history of the house whether they are representing the Seller or the Buyer.