When deliveries show up, they should be checked against the purchase. Did you get what you bought? This includes quantity and product type. Does the item look, smell, taste as you expect it to?
The materials should be cleaned of any dirt or residues from warehousing and placed in the studio where they will be used. Update the inventory counts in your system (whether this is a computer system or a physical system on the floor). File any certificates of analysis and make a note of when the payment is due to the supplier.