Worm castings storage

I started my worm bin about 6 months ago.  I used 1 year old wood chips, organic compost, 1/2 done compost, and some organic chicken manure to start.  My goal was to have high quality castings.  It looks done, maybe a piece of wood here and there, but it mostly looks like beautiful black gold.   I have a plan to separate the worms,I hope it works, but what I don't know is how to store the castings.  If I'm only going to get a couple bins a year, I don't want to store it wrong and end up ruining it.  I don't know if I should dry it out first?  Store it in an airtight container, plastic bag,  a box, burlap?  Help. Please.

You don't want to fully dry it out and you don't want it to be sopping wet, in my experience it maintains its outward appearance, including feel and smell, for a year when stored in a plastic bin or bucket.

You can collect the castings and spread them on a canvas tarp (plastic ones don't work for this, for me at least) to allow the excess moisture a way to leave.
I generally let this sit out for a day, I might walk by and use the tarp corners to move the castings around so the damp ones next to the tarp are exposed to some fresh air or I might forget to do this, overall it doesn't really seem to matter much.
Once they aren't dripping moisture I move them from the tarp to some news print paper that is easier to manipulate into a funnel shape so I can put them into empty feed sacks for storage. (I use feed bags because I have lots of them all the time, they also let some air pass through but most bugs can't get in.)

I don't want the castings to completely dry out because the dust from them can be irritating to lungs, eyes and throat.
I haven't stored them very long but I know two market farmers that have some that are two years old and still in good shape in their feed bag storage system. (these guys have mentioned that the castings are good up to three years stored this way, mine are gone in just under a year so I have no personal experience with longer term storage of castings, I do feel like they are good, honest folks though and I trust what they told me about their own worm farming businesses).

i put mine in a small barrel with a piece of plywood on top. its not airtight so it slowly dries and cures. top is fairly dry but 6in. down to the bottom is slightly moist .i like to keep it out of the sun as uv will kill some of the bacteria and fungi in there.