1, tax issues: Counter salesmen in some shopping malls may not be qualified to issue invoices or are unfamiliar with tax procedures, so they cannot provide invoices. Retail sales may be adopted, and there is often no requirement for issuing invoices in retail links, so invoices cannot be provided directly.

2. Special properties of jade: jade is regarded as an art or antique, and may not be classified as a normal commodity transaction according to the tax laws and regulations in some areas, so there may be no corresponding invoice process at the counter of shopping malls.

3. Informal vendors: Some jade sales at the counter of shopping malls may come from private or small-scale vendors, who may not have established formal enterprises and have no ability to file tax returns and issue invoices.