I have some
core memories stored in my garage which is relatively
dry, but I don't like the risk that they get corroded.
Put them in an antistatic bag with a small bag of silica gel inside the bag.
Pack in a box with more silica gel.
Silica gel is often reusable. Bake it in the oven to drive the moisture out.
I wish I remembered the details, but make sure its a electric oven, or
toaster oven as a gas oven has too much moisture. Something like 325 for
half an hour.