The person who left such balance might comeback on where he gamble and claim something he left so for not telling the truth we might get a huge shame especially if the person is so sure that this is the machine they used. So its better to be more honest so that not problem will arise and let the casino worker handle that situation so if the costumer comeback and ask for the balance he left then he can give the money left in any form the casino workers want.
Although its really tempting to stay silent especially if the funds left by previous player is so huge but we need to declare it so that we can get peace of mind while playing and we will not get accused that we are stealing their balances left on the machine.
That's why we better report it to casino workers and hand over the balance to them so that we won't be accused of things we didn't do. This is important, especially if we often visit the casino because it can give us a bad impression. After all, we have done something inappropriate. We have avoided problems if the owner returns by handing over the balance. The owner will probably thank us by handing over the balance to the casino workers. Who knows, the owner will reward us for helping him hand over the balance to the casino workers. And it's better for us to be honest so that it doesn't cause problems for us.