Representative for dropping b1/b2 visa renewal with interview waiver

I want to spare my mother who is 76 from making a tedious journey to just drop off the passport and documents at the Dropbox in Hyderabad for her visa renewal with interview waiver.
Can a courier or errand service person with valid identification take the documents and drop off at the Dropbox as her representative.

Yes, person with a valid gov ID can drop off.