The life span is irrelevent if they are already infested, because an infestation means that eggs have been laid, more eggs mean more bugs mean more eggs. The year doesn't matter if there were eggs being hatched in a cigar or two from the batch of the box. I wouldn't worry about freezing though. Just inspect each cigar from every box, I mean you do that anyway I'm sure. If I were you I'd carefully look for pinholes and other obvious signs. Also these bugs are likely to fly out of the box when you first open it, another thread discusses how they're easily spotted sometimes because of the simple fact that they fly out of cigar boxes and other small areas like desktop humidors. I'm rambling I know, I'm just saying I never freeze my cigars, I just look for obvious signs and then store them on their own for a few days until I introduce them into my main stash just to avoid a major outbreak. Hope this helps, but it probably doesn't....sorry