Is Gome Online SLR Beijing Yi Rui Photography Equipment Store genuine?

It should be genuine, with its own official website.

Those who issue formal invoices can generally rest assured.

In fact, there will be no knockoffs for such things as SLR (because there is no technology), only parallel imports such as Bank of China and renovation. And this kind of big store generally has no problem (there is an invoice, there is a seal on the package, and there is no trace of disassembly)