antique donkey cart sides from France

My wife, Gale inherited two antique donkey cart sides with scenes depicting Napoleon’s entrance into Firenze after crossing the Alps.  I do not know the date of the cart sides but my wife’s brother befriended the wife of the American Ambassador to France in the 1940's and we were told that when he retired, the French Embassy gave him the cart sides as a gift.  My wife’s brother inherited them in the early 1960’s and he passed away in 2003 leaving them to us.  We are concerned that they may be very valuable and if so, I need to have some sort of price for insurance.  They have been displayed on a wall in the house for years and we are worried about preservation of the panels.  Would you also have any access to an appraiser?  We are curious as to their worth.

Fair