Two, the use of certificates as a legal basis may not be useful.

Shops may sell real A goods, but they just fool customers with inferior A goods and high-quality A goods. However, due to the particularity of jade, it is difficult to theory.

Of course, the certificate may also be fake, and the non-standard appraisal agency "shoddy", but the real thing may be the real A goods. If it's BC goods, it's easy to handle, and it's also easy to handle with invoices and other basis.

Third, due to the huge amount, we can still try to take legal procedures. Maybe you can ask other questions to modify keywords and categories, and let friends who are familiar with the law give you advice.