When you walked in the side door, you have managed to step on something sticky. It's dark and you can't see what's now on your shoe, but you continue forward, miss placing your foot and discovering the sticky stuff was slime.

Falling down the stairs on your left, you scream. When you slam into the pad locked deep-freeze and a couple of boxes, you dropped your package. Now you can feel a big headache coming on.

All of the boxes look like the package, almost in a duplicate kind of way. When you hear a distant crunch you think the owners have heard you and are coming, so you muck around looking for the package.