I think the others have steered you right.
I have about 4-5 20ct desktop humidors which are still nib, and a couple of 25-50's that are not in use, and maybe more I'm not thinking of. I ended up using inexpensive coolers for main storage in my climate-controlled 65 degree shop, then a regular cigar box or an airtight canister inside my not-so cool nor dry house to keep the handful i'm going to smoke now. I didn't buy the ready made trays to put in the coolers because only the sides of most are spanish cedar (bottom is veneer over mdf), instead using plastic trays that better utilized space. I have spanish cedar pieces scattered all throughout my coolers for the benefits it offers. Nobody ever sees my cooleradors, so I'm not concerned about them being pretty as much as being effective. I even have a wine cooler that works, but I ended up unplugging it because my shop is too cold, and there's no room in the house for it. I'll move the contents of that into coolers eventually. I considered for a second offering something for your locker, but realized I have no use for one. I'm perfectly happy with the $25 coolers and will buy more as I need them.