I'm familiar with that humidor and the manufacturer. We USED to carry that item long ago and believe me, I can relate to your "pain". The manufacturer changes them all the time based on available materials and what day it is.
That humidor comes in two different models, a front loading and rear loading type. The old pictures/design they did use real nice cedar rails for the trays. At some point the manufacturer changed to little wooden pegs instead of rails, thus the trays are now a bitch to get put back in. Plus other little changes from one order to the next would occur, like the knob or a slightly different color stain.
I'm not going to comment on the retailers actions on the return or how they handled the situation. I think everyone can make their own judgement on how they would like to be treated in such a bad situation. PLUS, its only your side which is posted.
I will say that it does really pay to deal with your local walk-in stores and online retailers who actually have inventory on hand when it comes to such items. The best price is sometimes the worst service...
When you order through someone who sells and drop ships products, you have a good chance of being burnt if something is not right with the order. I'm not familiar with that company, but perhaps that is the case because they didn't know the item had changed before they shipped to you. I knew about that change over a year ago when buying those humidors for our local bars, so it was NOT a recent change.
Good luck! Hope you stick around and get to know the crew here. We can all turn you on to better retailers and sources for cigars and accessories!