I remember reading that some think it'll be hard to find excuses/disguises for customs, specifially for atomizers, etc.
So lets throw out some ideas for attys and other stuff (for the Chinese or Domestic distributers/sellers/manufacturers, if they're reading this)...
Glass
tank replacements - TIG welding cups (just remembered about them today!), LED bulb covers (landscape lighting, house/shop lighting, etc.), car-fuse/relay enclosures or covers.
PC
tank replacements - LED bulb covers (landscape lighting, house/shop lighting, etc.), car-fuse/relay enclosures or covers.
Coils - car-fuse/relay holders (the look/work very similarly), soldering iron.
Mods - power banks, voltage testers, flashlights, thermometers for cooking or other uses, soldering iron.