What should we tell our clients if they need proof of address to register a U.S. company?

No registered company can provide this address proof unless they rent a real address in the local area. We can provide the PS address proof service at 980rmb per copy, but we cannot guarantee that it will pass the platform audit. However, all of our clients who have entrusted us with the process so far have passed the verification. We let the local professional team in the US handle it.