Found in a "daily devotional" book for teenagers (girls, based on the color scheme: a nice $50 bill, which went promptly into the Friends' emergency fund, with a note in case someone calls looking for their mistakenly-donated book.
We have a theory on this one: Someone is gifted a nice daily devotional book from a grandparent or aunt, who inserts $50 as the main part of the gift. The gift-ee, not being the daily devotional type (most people don't seem to be - these types of books don't re-sell well at all), tosses the book in the donation pile without opening it, thus missing the rest of the gift. And somewhere, an aunt is waiting for a thank-you card mentioning the lovely cash.
