Which of the following is a requirement for sales receipts in precious metals transactions?

In transactions involving precious metals, it is essential for sales receipts to include detailed information about the specifics of the transaction. This includes the types of metals involved, their fineness (which indicates the purity of the metal), the weights of the metals being transacted, and the prices that were paid. This comprehensive documentation serves several important purposes: it provides transparency in the transaction, allows for proper record-keeping, and helps buyers and sellers establish and prove ownership and value of the precious metals.

Recording such detailed information is critical for compliance with legal and tax regulations, as well as for safeguarding both parties' interests. By including all these specifics on the receipt, both the buyer and the seller can reference accurate data in future dealings or in the event of disputes.

The other options do not encompass the breadth of information required for proper documentation in precious metals transactions.