Found old whiskey

[Bourbon1]

Hi I have a bottle of 1998 Middleton whiskey that I opened and sold one measure in about 2005 it has not been opened since I also have a bottle of special old liqueur old bushmills Irish whiskey the bottle size is 13 1/3 fl.oz. This bottle was opened only two days ago . So are these bottles of any value to anyone

[Good Whiskey Hunting]

Once they are open they lose their collectable value. I don't know anyone who would buy a bottle that had a measure or two gone.
The Midleton may have oxidised a little over time too. I don't think an open bottle would last a year in my house.