Leomund's secret chest

Leomund's secret chest was a spell that allowed the caster to hide a chest.

Effects
On casting Leomund's secret chest, the caster could put a chest on the Ethereal Plane, keeping it safe there for sixty days at maximum. The spell failed one in four times when the content of the chest was a living creature. The caster could retrieve at any point during the sixty days with an exertion of will.

The spell did not work on ordinary chests. The chest needed to fulfill some requirements. It had to be an expensive well-crafted thing of at least 5,000 gp, if wooden, its material needed to be either ebony, rosewood, sandalwood, teak, or something similar and its metallic parts like nails had to be made of platinum. If metallic, its material needed to be bronze, copper, or silver with fittings of silver or electrum.

When the aforementioned sixty days ran past, there was an ever-increasing chance that the chest became lost forever, even a wish spell could not remedy such an occurrence. However, mundane search had a chance of finding the chest.

Components
The spell only required only somatic and verbal components but also a focus in the form of small replica of the chest to be hidden away made of the same materials.