Wrap in a couple of layers of wax paper and seal into a durable air-tight package by overlaying with foil tape, if your hard-core get the stainless foil tape, assembled sticky side to sticky side while pressing out the air with your fingers. If it doesn't decompose on its own that sot of packaging should last for years.

Ive done this with lighters and matches and they show no deterioration after a decade. How it works on solid fuel materials is still up in the air but for matches and lighters it seems to last indefinitely.

The foil tape is available at any hardware store and is sold for permanently sealing duct work. You want the stuff that has a waxed white backing tape over the acrylic adhesive. Not the regular duct tape.