The Speckled Band Advanced CTF Challenge

Riddle:

"I am a box that holds clues, but you can never see the boundaries unless you look closely. I can change my appearance depending on my surroundings, yet I remain in my place. What am I?"

Excellent! You solved the first part of the puzzle. Your next clue lies in the image below. Analyze it carefully to find the hidden code.

Hidden Clue

Look closely at the image! It's not just what it seems.

The case is still unsolved. You must deduce the answer logically.