Lockbox of Investment

This wooden 2ft long, 8 inch wide, and 8 inch deep; lockbox has a simple lock to open it, and a small slot in the top for sliding in coins. When closed you can hear the coins and wealth and items of value shifting and rocking around inside, but when the lockbox is opened it is empty and barren, showing only a velvet cloth interior.

When any item of worth is placed inside the box, and the box can close around it, the item is transported to the internals of the box. Once the worth inside the box equals to 1000 pence the effect of the box activates and any added worth is added to the premium for up to 3 Days afterwards.
After 1 full year inside, the box will open and pour out 150% of the worth in gold of the premium that was placed inside.
The Box will open and expell it's content's no matter where it is, or who currently owns or holds the box. The Box can hold up to 5 different accounts that it will take care of before it accepts no more funds placed inside, acting as if full already.

Item type

Magical