This is how it works.
A person receives packages or parcels containing various sorts of items which were not ordered or requested by the recipient. While the package may be addressed to the recipient, there is not a return address, or the return address could be that of a retailer. The sender of the item(s) is usually an international, third-party seller who has found the recipient’s address online. The intention is to give the impression that the recipient is a verified buyer who has written positive online reviews of the merchandise, meaning: they write a fake review in your name. These fake reviews help to fraudulently boost or inflate the products’ ratings and sales numbers, which they hope results in an increase of actual sales in the long-run. Since the merchandise is usually cheap and low-cost to ship, the scammers perceive this as a profitable pay-off.