Depending on how big you need it ( lots and lots of toys?) there are

lots of lockable containers at military surplus stores.

A 50cal ammo box painted powder blue with some stickers on

it may not be too obvious.

Paint someone else's name on it and tell your parents you're

minding it for someone whose parents give her absolutely no

privacy at all, love letters and such. Put a card in there with

"I love me" on it and it's all strictly true.

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Calm, quiet, smooth, devastating