I have often found money in dreams and it invariably turns into something out of the norm, like silver coins or valuable papers or just strange, rare looking coins. I often look for the person who might have lost it because I find it out and about somewhere in the dream. No one claims it.
It doesn't correspond with actually getting or finding money, although that has happened. It's more symbolic, I think. Like, valuables aren't money; money isn't what it seems; something of that sort.