They say... You should wipe 'em down with oil after each use.
I tried that for a while and found out that oil is a great magnet for dust and other things, like CAT HAIR.
I quit oiling the outside and just oiled the inside for a while too.
Quit doing that after a while, 'cause the oil on the inside tended to gravitate to the bottom of the oven and would sometimes get "sticky".
Now I just make sure they are clean and DRY before stowing them. I also take one or two paper towles, fold or roll them up and use as a moisture wick, with the end sticking out between the lid and the oven.
Right or wrong, this works for me. I do wet the inside with olive oil, just prior to use.
No fancy carrying bags or storage boxes yet on the horizon or forseeable future... (Sorry Rock)
BTW Matt,
I only have 15 DOs at the present time...