If a buyer is wondering when the seller purchased the home, the buyer can review the title report, it will show the date. Or the buyer can to the tax accessor's office and look it up. It's not a secret date nor privileged info.
As indicated in previous answers, if a buyer's lender has an issue with the home being a "flipped" property, there are several ways to resolve any questions--including that of value--that a buyer's lender may have.
A flipped home doesn't mean an its an unsellable home, nor a problem property.
Most realtors will disclose it if they anticipate an issue with certain types of buyers, like those using an FHA lender that MAY have a 90 day flip rule. The seller will not need to disclose it as it's obvious from title report, but when you're trying to find a qualified buyer, you'll want to select from one that can qualify to buy the home....simple logic there.
Seller doesn't need to disclose..It WILL come up in title and through lender
and the Buyer's agent should also already know that the home was just purchased 45 days ago, etc.
My investors buy and sell these all the time in under 90 days. Never an issue.
2nd appraisal required with lender.
Why wouldn't you want to disclose?