sumtimes its a 'premium item' for the brands. for example, HP can ask china factory to print HP name on 1000 mouse. These mouses are used as 'premium' gift to customers. it doesnt mean HP make these items.

sometimes HP can reject the shipment so china have to dump the shipment to 3rd world countries (us!!!) cheaply to recover the loss.

its very normal for china to make a good quality 'show sample' then when mass shipment the quality is bad.