Urgent: First time F1 to H1 stamping with a recent H1 transfer

[pran10]

hey,

I have an appointmnet at US consulate , Vancouver canada on october 31st... following is my case...

I came to US on F1 got my MS in computer engineering. got my EAD(OPT card) valid till 07-29-2002. I got my first H1 from company A on 09-16-2002. and I changed to Company B on 01-13-2003.

Company B gave all the documents(Employment letter, LC Application I797 etc)

Will the consulate ask for Employment letter from company A?
Right now I don't have that and I can't get that also coz it is a small startup company and not existing anymore.
but I have all the paystubs, w2 and I 797 from Company A

and also please lemme know if I need to address the employment letter to the US embassy at vancouver ??

Thanks in advance