Usually, the result of a rehearsal packaging is that the agent creates a package on your packages page that you just have to pay for now.
This means, after you got the rehearsal packaging you cannot change anything about your customs declaration.
Some agents still allow you to do the declaration when you purchase the rehearsal packaging service, you just have to do it beforehand when you actually fill out the rehearsal packaging order form.
added: 6/26/2023
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How can I do a customs declaration when using the rehearsal packaging service?
When will I declare my package if I choose rehersal packaging?