A factory visit is not a magic guarantee. It is one of several checks, each with its own cost and its own blind spots — so it goes where the risk is, not everywhere by default. Before the prepayment, the supplier had passed my own filters and checks — the ones that work at that stage. No serious red flags were found, and I reported that to the client. The contract was signed between the supplier and my mainland company, Shenzhen SinaFirst Technology Co., Ltd, with stamp and signature, and the deposit followed.
The balance is a different point. By then the goods physically exist, the remaining payment is the larger part of the money, and after loading nothing can be corrected at the factory. A visit answers questions there that no document can — so that is where I went. Nothing needed correcting, which is exactly what the visit was for.