Joseph-
“What are the only English words with three consecutive repeated letters?”
Bookkeeper is the one I knew.
“The Problem Of The Brainwave CD Weights”
“…one is full of Cds…”
-So, there are multiple CDs per box.
Take one from box 1, two from box 2 and so on up until ten.
You now have a stack of 55 CDs.
Weigh the stack.
717 grams means box 1 is “delta”, 719 grams means box 2 is “delta” and so on.
I was comparing thisto Feivel’s “25 gold coins” puzzle.