Ancient Mystery Solved?!?

So Sammy is as usual hunkered down in his box which for years has been stuffed with various pieces of tissue paper making it super comfy for napping.

Upon closer examination I realized there are some curious markings on the box. 
What could they mean?

I decided to see if I could somehow decipher the mysterious hieroglyphics.

I concluded that the dark blue solid cube may simply indicate that this is a box.
The number? Box 11 I'm speculating.
The umbrella? Keep it dry.

So the decoded message must read...
 "Don't Let Box 11 Get Wet."

Well this now makes perfect sense as Sammy would certainly not want to try to enjoy his afternoon nap in a soggy box. 

Mystery solved!