Depends on the shop. If it small and the only one in town, the sales person is likely the owner or a relative. Depends on how you present your complaint, and the sort of person the shopkeeper is, but if you are known to be a picky/difficult customer, you might be limited to the items in plain sight, and the prices as marked. Where as someone else might be able to get parts ordered, or the shopkeep to search around a little for a suitable substitute. I need a magnifying glass to read those markings on those transistors myself. If it were only one or two pieces (dime each?), wouldn't bother complaining, I use both, and just be more observant in the future. A large order, from a big company, I'd raise hell though. I don't need a hundred of any wrong part sitting around.