SHELF LIFE FOR CARB?

How old is it, has it ever had gas in it
Holley's like to leak brand new out of the box let alone sitting for years but you never know.

About a year old, bought it new from Summit. All I've done is put an electric choke it on it, then back into the box. I thought there was already a small amount of gas in it from Holley's tuning/checking but not certain.