ask for a C4 representative to open the package for inspection. You're the customer and its your money so you have the right to get your money's worth.

C4 sells cheap products, but that doesn't mean we have to check what we buy, right?

In my case, whenever I buy something from C4, I take the time to scrutinize the item..coz I hate going back a replacement.

I tell them, if you can't replace the item, I'll return it and get something else which is of the same price cost/value AND WE'RE EVEN. And they agree to that...