Found some 1975 $50s and a 1954 $100.

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Yesterday the teller gave me four 1975 $50, all three letter prefixes, 3 C/B the other one L/B. The 1954 $100 was a B/R, unfortunately the notes looked as though they were borderline AU/UNC, but somebody crumpled the notes a bit before turning them in. All the notes had sharp corners, deep embossing, vibrant colors, etc...the $100 note was crumpled in the same way as the $50 notes. The teller said the person handed them in that way. But I sometimes wonder if some of these notes go missing from somebody's collection and the person who took them, try to make the notes looked used a bit before cashing them in? Or maybe some people intentionally ruin the notes before handing them in so they lose a lot of their collectable value? But it was a shame because these would have been great notes to keep if they weren't crumpled.

There could be all sorts of explanations as to how these found their way into a bank - yes they could be stolen, or they could have been legitimately retrieved from somebody's mattress after 25 years, or found inside an old book, or at the back of the sock drawer, or inherited from an estate.  I don't think they are intentionally crumpled before depositing - obviously the person depositing isn't thinking about their collectible value and just doesn't care to handle them properly. 

Are you going to keep them?

Yes, I kept two that were in the best condition, the other two I sold them for $55 each, so they are gone now.