Yes, on board courier services in China can provide delivery confirmations or signed receipts as proof of successful delivery. These services often offer real-time tracking and updates throughout the delivery process, allowing customers to monitor the progress of their shipments. Once the package is delivered, the courier can obtain a signature from the recipient as proof of receipt. This signed receipt serves as evidence that the delivery was completed successfully and can be used for verification purposes. However, it's essential to check with the specific courier service provider regarding their policies and procedures regarding delivery confirmations and signed receipts, as these may vary among different companies.