Seller sold windmill before closing.

[Buster Brown]

So we’re buying our first flip farmhouse on a few acres. We are buying from homeowner during their redemption period for the payoff. Good buy. We’ve been in contract with Ernest money at title company. The farmhouse is really cute and the windmill which is an antique aermotor 30’ tall needs work, but someone she said could have it (allegedly about a year ago) for a 100 bucks came and took it over the weekend. We’ve had the agreement to purchase deal signed for 3 weeks and this was not disclosed, however no disclosure form either. We have a simple buyers agreement and we’re buying it cash as is. Wouldn’t our contract nullify any previous promises since the windmill was taken during our pending status?  Evidently it took a few men with a boom truck to take it. Looking for ideas on what to do about it. Too much meat on the bone to walk, but the windmill was iconic to the ambiance of the property.