What is this?

I knew something was off about that tracking number on that package. It was code, saying LOOK UNDER. I felt around the label, and one part felt a little thicker. I peel off the label and look:
There's another paper hidden under the label. Unfolded, it looks like this.

Here's a better look at it.

I've been staring at this for hours, and I have no frigging clue. The sun's down now, and I'm going to give in and try to get some sleep. I'm so tired, I almost don't care what happens anymore.