Bread getting hard, dry and tough on box.

Hey there! Hope everyone is doing great. I'm having a situation with my business of cinnamon rolls. The thing is that I always sold them in those aluminum pans/trays covered with plastic film. Now, for better presentation I sell them in boxes (the typical box with a window). When I sold them in aluminum, softness remained for days, even a week. In the boxes, cinnamon rolls are getting really tough on the outside (the exterior part that touches the box on the inside). In the second day, it's incredible hard, like a rock. 

I have done several tests. Recipe isn't the problem, as in aluminum they don't get hard. I did another test with the same batch and I saved half on a zip lock (open) and half in the box. The next day, the ones in the zip lock were soft even when I left it open. The ones in the box started to get dry on the exterior. I then thought that maybe I was throwing them in the box when they still were hot, but I also made the test to left them to cool completely, and also putting parchment or wax below the rolls. Made barely a difference.  

I'm worried as I ordered 2,000 custom boxes last month (before noticing that this started to happen). I don't know what I can do. I thought to use that plastic or polyethylene on the outside of the box, but it's time consuming too. Most of the boxes I sell go to stores that have them for 1-3 days.

I hope you can advice me.

Cheers