I would also get some silica packs and put them in the boxes to absorb any high levels of humidity.
Storing tube gear
I have to put my tube monoblocks and tube line preamp into storage for a few months. Should I leave the tubes (power and input) in or remove them? Mechanical damage is not a concern since the gear will be stored in a storage facility, most likely with air control, and I have the original boxes. Any advice would be appreciated.