This may be of interest to you if you live in California. It's the California Unclaimed Property Search, a database of assets (mostly money) that the state is holding for people. A lot of the friends I've looked up in it are still at the addresses the database has for them so I don't know why the state doesn't just mail them a check. I do though see a lot of actors and writers in there who are listed at being at the address of a former agent who's no longer in business.
Take a moment to look yourself up…and also look up any deceased relatives whose unclaimed funds you may be able to claim. You may find nothing and if you do find something, it may be an amount not worth the hassle. It's especially complex — though not insurmountable — if you're claiming money that's owed to one of those deceased relatives…and I speak from experience. But maybe you'll find they have a sum for you that's worth wading through the red tape to claim it. Maybe…but not likely.