I had this long post, but, I think the general idea here so far is:

Make your stuff look unattractive and uncared for.

Old, worn out, or disassembled in a few pieces. Maybe fuel in old looking cans, or bottles (I'm assuming lamp oil here).

Make your storage unit scream and/or smell: "I have a mental problem, or someone else in my family does that won't just let me throw this crap out".

Use plastic bags to store your good stuff.