My belief on that is simple,, if the first person inquired with a serious offer,, that should come first !! Honesty and integrity is important in this business !! You put a price on it,,I would say honor that price, then if it falls through, go to next on the list !! I don`t see playing people just for more money !! The museum probably has limited funds,, Check them out on google before making a decision there !! Make sure they are who they say they are !! I always give those that make serious inquiries X amount of time before going to the next one !! Not ebay of course but other sales where I have control !!