It is night now, and moonlight pours through the one open window in the room. The moon outside is full, the light it casts bright and rich. Almost the moonbeam reaches the table. Almost it reaches the box. The moment he has been waiting for has very nearly arrived.
He continues to hold station against the wall. His body is sore from remaining motionless for so many hours, but he barely notices. His focus is single-minded, his muscles taut with anticipation. The moon continues its descent, the beam of light it casts now touching the table surface and beginning to inch toward the red box positioned at its center.
Yeeeesssssss, he thinks to himself and releases a held breath.
Finally, the light slips over and around the box, and the surface of the box changes with the light. A series of geometric depressions sink into the wood, each separate from the others but seen together forming a rune-like shape.
He moves instantly. The moment he has been waiting for has arrived, and it will pass far too quickly.