Where to hide sn without buying anything for that

[Caribbean Sky]

Where can I hide my sn without buying anything?

I'm very trapped due to illness and have little money, making it actually tricky to afford a locked safe or a fake hollow book or any other clever idea unfortunately.

Very soon I can buy a safe or something but rn my sn is already at the ups and I want to pick it up soon b4 they return to sender.
So what are some ideas for hiding it without buying something? in-plain–sight ideas, special kind of container, will my sn be ok if I hide it in dirt outside, etc...

 

[NearlyIrrelevantCake]

You cannot hide it outside, it needs to be somewhere at a stable temperature indoors.

 

[frayed]

how much sn are we talking here?

 

[LastNite]

if you already got books you could carve them out and glue the sides to make a hollow book safe yourself.

 

[Box]

i'll be hiding mine in an old pc case

 

[HumanoidMonster]

I live with my parents (and they have a history of getting nosy about stuff in my bedroom) and I have decided that I will hide my SN (once I, hopefully, get my hands on it) in an old console box I'm hiding in a cupboard under my bed. My parents rarely check that cupboard and, if they do, they never mess with console boxes, since they can contain fragile stuff or cables etc.