Client letter for H1B RFE in India

I have the H1B for client A and not travelled yet I. Now got another project (client B) so I my employer filed relocation amendment and I received RFE for that amendment to provide client letter/ sow , i got the client letter and couldn’t get sow . But my company says that USCIS will not accept the client letter , since I haven’t travelled to US not even once . Please can any tell me clearly . Will USCIS accept client letter if I’m in India and not travelled yet .