Chainsaw. Location: Issaquah Washington
Yup. I live in a humid area ... Dies are in their boxes in the bins. Keeps everything tidy and rustless.
If I were ever to sell or buy dies I would want them in the boxes.
I live 5 miles from Issaquah, as the moisture flies, and I have been observing what rusts and what does not for decades. We have mild dry summers and cool wet 9 month winters. Ferrous metal over a pound, and certainly over 100 pounds needs to be a degree F over outside temperature to avoid condensation. As an example, an unheated concrete floor garage with one wall in common with the house, but insulation between the house and garage, the heat leaking to the garage will keep it at least one degree above outside temperature. In a steady state there would be no condensation and no rusting. But when the weather changes [transient condition] and comes from the Southwest through the Chehalis gap, it brings higher temperatures and 100% humidity[rain]. Large ferrous objects, like a 1000 pound cast iron mill, will not heat up fast enough to prevent condensation. The mill had been 1 degree above outside temperature, but now the temperature is much higher, 100% humidity, and the mill is still cold and condensing water droplets. What to do;
1) accept rust
2) paint with motor oil on a tooth brush, and replenish before oil evaporates
3) more heat to the room
4) cover the mill with sheets or blankets to slow down convection currents.
5) move to AZ
Meanwhile, a 12 ounce hammer, stored in the same 1 degree heated garage will stay rust free for 50 years. Put that same hammer in a dirt floor unattached tractor house, and the hammer will rust in 24 hours.
So are all small ferrous objects safe indoors around here? No. If I lean a gun barrel against a concrete wall in the basement, the point of contact and surrounding inch of metal may rust.
I do not have a predictive math model of why the sheets work and the concrete basement wall lean does not [not good enough to invoice for money on an engineering project], but none of my dies are rusting outside the thrown away plastic boxes. I would bet money that the inside of your home is at least a degree above the 52 degrees in Issaquah right now.