How to claim consignment shop income

I own a consignment shop. I am trying to figure out if I need to claim money owed to consignors as income, or if it's excluded because it's technically not my money.

For example, I sell a purse for $100. $50 goes to me (the store), $50 goes to the consignor. Do I, the store, claim $100 income, or only $50 income? What if the consignor never collects their $50 and it's just sitting in an account waiting for them?