Do you know why your mother always said to clean up your food? Well, since you didn't, it's now brown mold. It's in a box, and opening the box lets out the spores. Put a lock and some cheap bling in the box to further lure in greedy munchkins.
Detect: Per-based Alchemy.
Circumvent: Automatic (don't open the box).
Evade: Vision at -2 allows an HT roll to hold your breath.
Effects: 2d burning with no incendiary effect to the opener and everyone in a 1-hex radius of him. Victims must roll vs. HT at -1 per 2 points of penetrating damage or be paralyzed (roll vs. HT at same penalty every turn to recover). This is "freezer burn," not flame, so cold resistance works but fire resistance is useless.
Steal: Yes; you have a nasty-looking small wooden box ($2; 0.25 lb.) of mold.