2. Not taking it on the first day does not mean not taking it on the second day; If you don't take it on the first day, it doesn't mean that you won't go through the entry formalities; The entry formalities are not necessarily all kinds of documents, sometimes just fill out a registration form first.
Many companies don't sign contracts on the first day. Of course, this is a violation of the labor contract law. These units are all to save trouble and don't want anything to happen during the probation period. Maybe someone will be dissatisfied and leave for two days.
You can mention the labor contract, but don't delve into it. Because of the factual labor relationship, it is also effective.