Switching to an F1 while on an F1(OPT), with a pending H1B visa petition

Did the company apply for change of status?

The original approval notice is a company document and they are to retain it. You cannot file for the duplicate. You are entitled to your...

H1B transfer with cancelled approved notice

Withdrawal notice by Employer A will not impact H-1B petition filed by your new employer if you are not in the U.S.

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Can I become an employee of non-e-verified company if H-1B visa is filed but I am working on OPT extension?

If the OPT will be extended you continue to work for e-verified company until the H-1B approval start date with your new employer.

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Do I need New LCA before filing for visa amendment or first file for amendment and then file for new LCA?

Let your employer worry about this.

I797 revalidation or extension

Depends on the last date of employment.

H1b Petition courier marked "Attn: I-129"

It is not likely to be rejected right way but there may be a confusion as to whether it will be counted towards the quota

Is there anything i can do to hurry the process? i did the application on my own and had it reviewed by a lawyer,

Provide more information regarding the application your filed.

Want to Start Project Immediately, new role and location : Filing LCA and amendment : Grace Period

I agree with my colleague. This question the company should address to their attorney, not the employee to a forum/ attorney.

Can I stay at different location other than the LCA location while on bench?

Benching without pay is not allowed. Consult with an experienced immigration attorney if you continue to stay in the U.S. You may have issues...