My client bought and held silver for several years as an investment. They sold it for a loss in 2017

The Canadian dealer provided an invoice for the purchase and the sale. 

From this, I entered the purchase date and cost basis - the sale date and proceeds.

I indicated a 1099-B was NOT provided.

I checked the box indicating the transaction relates to collectibles (per IRS Sch D instructions, line 18, collectibles = silver bullion).

Is this the correct entry - do I need to think about anything else?

Should I scan and attach the 2 "invoices" from the metals dealer/broker that provide the dates and dollar amounts?

Thanks.