Supposedly, in a perfect world, a tubed cigar is supposed to be fine on it's own in any normal environment. That's "in a perfect world"......

Chances are that the tube has been opened once or twice or thrice or.........

If you know for 100% sure that the tube has never been opened and is sealed tight and hasn't been left on the dashboard top in the sun or on top of anything hot, it should be perfectly fine as is.

But since that is difficult to be sure on that, I would put it back in your humidor opened for a month or two, if not longer.

But if the cigar has dried out, sorry, it's hopeless. The flavor is gone and no amount of time in a humidor will bring it back.

Tubed cigars are great for travel, etc when you can't bring along your humidor. The industry claims as long as the tube remains tightly sealed, unopened, the cigar will stay fresh for a long, long time on it's own.