Costco Wholesale Corporation (NASDAQ:COST) steps into the earnings confessional tomorrow, with the discount retailer scheduled to report fiscal fourth-quarter financial results after the close. Ahead of the event, COST sports an intriguing technical setup worth exploring.Looking back at the last eight quarters, COST's post-earnings are a mixed bag, with four moves higher and four moves lower. There’s the muted 0.7% drop back in May, but the shares added 4.4% the day after the company’s December report. This ...