The core problem with sourcing packaging from another continent is not quality. It is verification. You are being asked to trust a description of a factory you will probably never visit, and most of the reassurance offered is not verifiable.
Certifications are worth checking, but check the certificate rather than the logo. Ask for the number, the scope statement and the audit date. A scope that covers a different site or a different product category is common and easy to miss.
The golden sample is the single most useful control available to you. Insist on a fully printed, fully finished physical sample, sign it, and make it contractually the reference for every production run. It converts a subjective argument into an objective comparison.
Ask which specific site will manufacture your programme and why. A supplier who answers with reasoning — volume, finish, destination port — is thinking about your economics. A supplier who cannot say is probably brokering the work.
Finally, test responsiveness before you test quality. Send a technical question and see how long it takes to get a real answer from a named person. That response time will not improve after you have placed the order.