Well,
I didn't know anything about the purple storage box company.
But there are valet/storage services. Some people camp and UPS ship their things ahead and back home to avoid the plane hassels. So if you get the purple box folks to deliver and pickup before/after 24 hours after your arrival, it should work.
I haven't heard of many campers using their services honestly. I can honestly recall one camper years ago who used their service. But the Fort does have luggage/valet temp storage services.
Bama ED
PS - 120 views as of this posting aren't alot IMO. So don't give up. Chin up, brother.