@mgalaxy3 you need to deal with right people having a reputation in trade.
which city you are from
in rawalpindi there is a bullion dealer operating 3 shops within 1 km radius. Haji Mohammed Rafeeq Saudager is name of grand father sons & grand sons manage the business. They have reputation of over 65 years in trade. his brother have 2 shops in Law_hore in rung mahl area.
in Karachi you can visit Zaibunnisa street 5 shops New era, hameed sons, new ruby, Hussian brothers Kiran Goldsmith, Madras Jewellers & Tariq Fareed are masters of this trade. Over Tariq Road Tariq Jewellers & Motiwala have good reputation
every item of metal they sell they provide an invoice