Kinda doubtful, but...

If Della’s riddle in “Castle” had something important indented on the back of it,

could the kids discover something important on the back of her farewell letter? 

I mean, they’re both mysterious letters she wrote in cursive. 

And rubbing the back of a document with a pencil is a pretty useful method that could return...

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*•. ̧♥ Originally Posted ♥ ̧.•*'
  ˜”*°• January 7, 2020 •°*”~

Aww man
It was a good guess
Did they consider it? Ran out of time?
Hmm...I already felt there was some hidden importance with the riddle
Now it feels even more important...