I am kind a busy right now but you seems to be unaware since 2015 American Embassy Nepal stopped going through bank balance document. They have mentioned as not necessary documents. We all know even the so called genuine bank document can be loaded with borrowed money and create original documents infact there are two types of these documents. One kind of documents which can be created by borrowed money most consultancy has people working on there behalf that deposit and another types of documents can be made ditto copy.

P.S: Bank balance certificate ( not bank statement) are often used only for admission process during the process of getting I20 not in visa interview.

P.P.S Just incase lets assume American Embassy found out those bank balance were fake so you think they are going to call to the bank for its verification. Every one knows major Nepalese submits those documents during the admission proces this including the visa officer.

There is an article regarding the information in TKP just for your verification on bank balance and American embassy. I will reply each of your answer prolly once i get some time.

Ohh i forgot we infact get alot of  request from Nepali student living in USA to send scan copy of of those Bank certificate required transferring college from University to colleges or vice versa under the (Name)sponsorship of there father.