If you are looking for a "useful paper" in the sense of a financial instrument instead of physical metal, you might be interested in :

: You may need to provide a recent bank statement or utility bill (no older than six months) to establish your address.

: Documents for a bank transfer, wire, or personal check are recommended to avoid triggering cash-specific reporting requirements. IRS Reporting (Dealer's Paperwork)

: Using a wire transfer or personal check generally does not trigger this form. "Paper Gold" vs. Physical Gold

: These are contracts or shares representing gold, such as Gold ETFs (Exchange Traded Funds), mining stocks, or futures contracts.