In some hospitals and big companies with lots of equipment in use, when there are new machines or when machine and equipment have been used for so long the company can decide to retire these machines, and how do they do this? they pack up these machines and keep them in a conducive store room.
I do not think that this is what happens to mining devices or any old ASICs because they are limited to use for one purpose, so storing them means that their value will decrease. These companies will sell and replace any ASICs if they do not generate profits, so selling them at a cheaper price to a party that may have cheaper electricity and will want to buy them would be better than store it for a year or two and then they may not be able to sell it and have to pay additional costs to dispose of it.
In Russia, I know telegram channels where you can buy any ASIC from old S9 to new ones, and these ASICs are bought by those who have practically free electricity.
Although I wouldn’t even use S9 ASICs even now even if I had free electricity.
Not only Russia, but in some seasons of the year, such as the flood season, electricity may be much cheaper, but it is rare to find someone who buys it in large quantities.