H1B stamping: employer's copy of form necessary?

[Salm]

I am on H1B status in the US, and I am planning to go to Canada for H1b visa stamping.
One of my friends told me that American consulate there needs some original form, which was sent to my employer by USCIS?!

I have I797 and I129 forms with me. Do I still need to take my employer's copy of one of these forms to the consulate?

Please help.

[nuser]

I think, you will need a copy of LCA filed by your employer, for you.

-- NS