What is antecedent of indefinite pronoun?

There is often no antecedent for an indefinite pronoun.

For Example:

"You may have some, there is more in the kitchen." (In this sentence, there is no antecedent for either pronoun, the speaker and the listener know what is being discussed.)

"You may bring anyone you wish." (There is no antecedent for the pronoun, the listener has to consider who that person may be.)

"Someone left a watch in the rest room." (There is no antecedent for the pronoun because the person is unknown.)

"We're expecting five people but none have arrived yet." (The antecedent is the noun people.)