1950-'54 boxed proof sets: Any way to tell for sure if they're cameo?

The problem, of course, is the cellophane. But is there a way to tell whether any of the coins are deep cameo?
Here are some images from a 1953 proof set I sold recently. The photos leave me, a novice, wondering. I have several other boxed proof sets I'm about to dispose of, but it obviously would make a world of difference if I knew for a fact if the coins were Dcam or not--the Franklins, especially.





Here are some images from a 1953 proof set I sold recently. The photos leave me, a novice, wondering. I have several other boxed proof sets I'm about to dispose of, but it obviously would make a world of difference if I knew for a fact if the coins were Dcam or not--the Franklins, especially.







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Comments
Just like the later flat packs, it is possible to get a general "read" on cameo contrast in the packaging. Careful examination with proper lighting can let you know whether a coin has contrast.
I have been fortunate to find a number of cameo/deep cameo pieces from these early sets. In all cases, I could tell they were cameo before removing them from the cello. Deep cameo pieces are a bonus when you get lucky enough to find them.
Even harder is determining whether a coin is gem or not. The cello is just thick enough to keep hairlines and other minor problems from being detected.
“In matters of style, swim with the current; in matters of principle, stand like a rock." - Thomas Jefferson
My digital cameo album 1950-64 Cameos - take a look!
Badger
Link to 1950 - 1964 Proof Registry Set
1938 - 1964 Proof Jeffersons w/ Varieties
"Keep your malarkey filter in good operating order" -Walter Breen