Supporting documents for B1/B2 drop box appointment

I have sponsored B1/B2 visa for my parents several years ago. I provided signed I-134 (Declaration of financial support) and copies of paystubs, employment verification letter, tax returns, passport, visa stamping and visa approval letter. They took it for their interview and got their visa approved. Not sure the documents the interviewing officer actually asked. Their 10-year visa expired less than 48 months ago.

I am in the process of renewing my mother’s B1/B2 visa via drop box appointment. I will be sponsoring the visit, hence besides the main documents mentioned in the confirmation letter, I will include I-134. Not sure whether they will accept other supporting documents via drop box.

Does someone at the dropbox counter, check the documents and take only what they need or just take everything that we provide?