Try with "Case Specific Enquiry" to CPC-O describing your situation.
They suppose respond to respond to Email also. Response may take up to 30 days.
After that your file transfer and VISA stamping will take 2-3 months (fair guess).
It is ok, if you can wait for 4 months from now for your VISA.
My spouse is not in USA. But, my relative is getting her passport from India to USA. So that I can't it to CPC-O further.
It is legal to send passport across the country by a person with custodial letter.
By the way, which country you are from?