I have two liquor bottles that are shaped like a donkey and an elephant in boxing gloves with top hats corks. They originally held Gilbey's Spey Royal Scotch Whisky. On the bottom of the bottle it is embossed Federal Law forbids sale or reuse of this bottle. Creation of James E. Beam Distilling Co. D-334-145-64 (c) C. Miller 1964 Genuine Regal China. Are they worth anything? Should I hold on to them? My Dad just passed away and he owned a bar many years ago. I want to know why he kept them so long. Thanks for your help.