Darkray's Preserving Box
(Alteration)

Range:  10 feet
Components:  V, S, M
Duration:  1 week per level
Casting Time:  1 turn
Area of Effect:  One up to 2?1?1 feet box
Saving Throw:  None

With this spell, the wizard can preserve an amount of non-living material for the duration of the spell. It must lie within a normal, non-magical box that fits entirely within the area of effect. The box has no special resistance but magical or normal wards or traps can be freely placed on it.
After the casting, the contents will enter a state of suspended animation and time will not affect them: fruits never rot, food remains fresh, etc. The box becomes sealed and outside conditions do not affect the interior.
Even the caster cannot open the box without ending the spell. The box will hold its contents intact for one week per level of the caster. The contents can then be placed into another box and the spell cast again or the wizard can cast the spell again before the duration ends, practically preserving the contents for an undefined period of time.
The material component is a normal box, which is not consumed, and a gold coin that melts and seals the box, vanishing after the duration expires.

