Thirty years ago, at least around here is was not uncommon for an older gentlemen-(the ones most likely to ware a hat) to have Zig-Zag paper with them. Prince Albert rolled by hand was much cheaper than "store bought". I have found them in old clothing before.
Slightly off-topic, I bought a suit at Goodwill for a Halloween outfit and found a funeral card for someone who died 15 years before. I suppose that was the last time the suit was worn.
Inside a late-'30s Cavanagh sweatband I found an early Social Security claim form with the mail-in portion already removed.
Keeping alive the Crofut & Knapp, Dobbs, and Cavanagh legacy since 2004. Visit my blog, The Hatted Professor.
I haven't found anything of interest in hats other than moth bites and ballpoint names on liners.
I once found the top half of a form letter of introduction (insert name) from an unemployed man who hoped to get work back during the Depression. I imagine him going door to door and handing the entire letter to the party on the stoop, while wiping his sweatband, beaded with expectation.
'There is a fine line between art and fondling.'
I've found things people use to pad a hat that is a tad too large for them including napkins and tissue paper (the most common) to band-aids and once a piece of rope in a late 50's Gun Club Stetson. The Stetson's sweatband had an obvious curve that made it obvious something was under the leather. Didn't look too comfortable to me!