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i bought some goods recently, and though you can do a tracking search you do not know when the goods are going to show, they couldn't leave things in the garden, not ours anyway, so if courier turns up whatever day, then if no ones in, off they go.
Unless they leave a card you have to do the tracking to see when to deliver next. Also i have something to return to the company, but they don't have free return service, some companies do, so you have to pay to send it back, via the post office. Not sure i would do this very often.