Gone are the days of coin buckets but this changed with the advent of coinless slot machines in casinos everywhere. Once you complete playing the slot the machines of you choice, hit the "cash out" button and a voucher is printed with the amount of the payout in lieu of coins. These are redeemed at the cashiers cage or the on the ATM redemption machines located throughout the casino floor.
For casinos, coinless slots and redemption machines meant reduced the labor cost for slot/change attendants. In turn it made it faster for for players to cash out rather than having to stand in long lines or carry buckets of coins. Players also didn't have to worry about machines running out of coins and then waiting for attendant to refill them.
The vouchers are almost as good as cash when switching machines. Cash out of one machine and use the voucher to continue playing on another. In a rush and don't have time to cash out, save it and play it later. Currently for accounting purposes, these vouchers cannot be played at other casinos even ones owned by the same company.
By the end of my stay at The Cosmopolitan of Las Vegas I had accumulated six vouchers and remembered to cash them before checking out of the hotel.
For the beginner, using a redemption machine is much simpler than using an ATM for a cash withdrawal. Take care when handling vouchers or tickets. Should you find yours unacceptable in the machine, there's always the cashiers cage.
Insert voucher/ticket in redemption machine.
The machine will read your ticket and display its amount.
Once approved, the machine will cash out your payout in paper pills and coins.
Collect your payout.
It would be wise to check your wallet a day before departure for any vouchers especially if you played at multiple casinos. This will give you the chance to return to the casino for the redemption. There is an issue of forgetful players forgetting to cash out and are not being able to return to the casino because, for example, they live in a different city. Each casino has their own policies and it would be wise to call the hotel for more information should you find yourself in this situation. It's possible the vouchers may still be redeemable for 30 to 60 days which still doesn't help if you're not able to get back to the casino. But since the vouchers are transferrable, cities with gambling heavy travelers such as those from Hawaii should not have a problem of finding an acquaintance who may be able to help to cash out the voucher on their own vacation.