How can I prove that the gold bars I bought are mine if I can't find them?

Payment method, camera method.

1. Payment method: cash payment, with the signature of the invoice, can be used as proof, not cash payment, but credit card or transfer, or as proof.

2. Camera mode: Go to the counter where you buy gold bars to observe. At that time, there was a probe pointing at yourself when buying and paying, which can also be used as proof.

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