Wire transfers done through cash offices are essentially anonymous and are designed for transfer between persons who trust each other. It is unsafe to send money by wire to an unknown person to collect at a cash office; the receiver of the money may, after collecting it, not provide whatever goods or services they promised in return for the payment, but instead simply disappear. This scam has been used often, especially in the so-called "419 scams" which often nominate Western Union for collection.