My folks collected Jim Beams, there is a Model T downstairs that still has bourbon in it. I broke into it a few years ago when I ran out. Yuck...that whiskey is nearly undrinkable. Try yours and drink it if you can.
I would guess you could value your bottles by seeing what they sell for on E-Bay. I know most all of my folk's bottles were nearly worthless. Good Luck and Merry Christmas.