Does wrapping a bottle of whisky in plastic affect the taste? I want to store a couple of whisky bottles with boxes in some idle place at our house. I'd probably sell these after 5 years. To prevent damages to the box, I'm thinking of wrapping the boxes of whisky but would it affect the quality of the whisky? Would the plastic cause the bottles to warm up?

The bottles will be stored in a location with room temparature. Not too hot nor cold. Also with no direct sunlight.
Plastic isn't going to cause heating, and won't impact the quality of your whisky. Plastic wrapping is likely to trap moisture, however, which could be a concern as it could damage the labeling on the bottles. If you want to protect the boxes with plastic wrap my advice would be to make sure you have airflow.