Protect your leather shoes from the moisture
Moisture is the worst enemy of leather. The leather is badly damaged when it comes in contact with moisture. This is why we get the tiny sachets inside the box of the shoe when we buy a new pair. These sachets are silicon made which keeps the moisture at bay and prevents the leather from damaging for a long time.
Your leather shoes may already have one or two silica gel sachets inside the shoe box. If you wish to keep the shoes stored in the box, keep the silica gel sachets to prevent their damage.