We are getting ready to move out of a rental. The landlord is selling the property and is being threatening to us. They stated "Concerning the sale of the property: Please be aware that we have filled out all the seller disclosure document fully and truthfully so you do not need to feel obligated to report damages or problems with the property to any potential buyers or other officers that are conducting inspections and appraisals unless those damages or problems are things that you are responsible for. Please be advise that any interference with the sale of the property or anything other than complete cooperation with the real estate agent, or officers listed above may result in loss of the refundable portion of the deposit and/or a lawsuit against you for any losses.".
We have been really good about letting in the buyers looking at the place and if they have asked us questions we have been honest about everything.
Can they sue us for anything since we have not blocked anyone for coming in and only answered questions if asked?

Also the landlord when we moved in did not have a checklist or anything for us to go over. The state of the property was not in the best of shape. Bad carpet, torn flooring, drains clogged, mold. Can they require us to do a checkout list for leaving when they did not offer one when moving in? If so what are our rights if they try to come after us for things that happened before we even moved in?

As long as you are telling the truth you should be OK, anyone can sell anyone for anything.

Moving in did you document, did you take pictures, write a letter telling and explaining what had happened.