After completing a horizontal and vertical analysis of the Balance Sheet and Income Statement. Cost of Goods Sold is increasing at rate that does not match sales or gross profit. While sales and gross profit seem to be trending down, the Cost of Goods Sold. Specifically, we see a drop in sales and gross profit in 2021, yet the cost of goods sold increased. What type of documentation and information should the auditors request to further evaluate for potential fraud? What might explain this inconsistency?