It is unlikely to affect the visa application. However if questioned on the incident, be truthful when answering about it.

Can my company sponsor H1B without client letter??

Your employer will get an RFE and if the complete details of employment are not documented, the case will likely be denied.

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If i have "I-797C" with receipt number of April 2008, how long it is Valid and how can i use it now (Apr 2013)...?

You are not subject to the cap if you were allotted a number in the past six years and you have not used up the entire six years in H-1B status.

1. If my sister was to put in the I-130 petition now, would this affect me from visiting the USA in the future via visa waiver?

How strong are your ties to your home country? Are you married? Will your family be traveling with you? More information is required to get a...

Is it ok to travel to my home country if I am a derivative asylee?

Consult with an immigration attorney who will review your case for asylum and conditions in your home country to advise whether travel is recommended.

Can I get my citizenship if I have two DUI's

Please see my response posted on your earlier question

H1b premium processing status is not changed.

It depends on the reasoning for the 221(g). If the Officer was not convinced with a factor relating to you personally or your education,...

1) OPT will not be extended if H-1B is approved 2) No if change of status is granted by the USCIS

L1 A in RFE and willing to file L2, I94 expired

You cannot seek change of status as your I-94 expired and the extension is not approved.

Do I need to amend my H1B visa after doing my masters

No