I have many unopened bottles of Canadian Whiskey and I was wondering if they had any value. Grand Award, 15 year old, imported Distinguished Canadian Whiskey from 1956. The US Internal Rev. # (356570829) and the excise # (C4453268) seals and still in tact. Registered at the Distillary, JM Douglas & Co. Limited, Montreal Canada, No. B 169272 and in the lower right hand of the label is WG-424A. Imported by Jules Berman and Associates, L.A. Cal.
2 bottles of Canadian Club- Blended Canadian Whiskey (1966 & 1973) 6 year old. Again, all seals are in tact as the previous described bottle. Imported by Hiram Walker & Sons Lmt.
1 bottle Seagrams V.O. 6 year old (1966) with all seals in tact.
1 bottle of Windsor Supreme Canadian Whiskey (1966) all seals in tact.

Are these bottles worth anything and does whiskey ever go bad after a certain amount of years? Thanks for you help....