Yard Sale find - help for a novice?

[stevew]

I just purchased three bottles of wine at a yard sale and I know nothing about the subject. First of all - they were stored in a shed, on their sides but not at all climate controlled. They are: Chateau La Dominique. St.Emilion Grand Cru Classe 1982, Chateau D'Issan Margaux, Mis En Bouteilles Au Chateau 1983, and Chateau Leoville Barton 1982 Saint-Julien. The labels on the 1st and last are peeling off and the foil on the very top of the cork is missing on the last two. I found the Leoville Barton on an internet site for $299. I guess my question is: Due to the condition of the bottles and poor storage conditions they were kept in, should I try to sell them or just open them and, if they are still good, just enjoy a nice wine?