Employment Letter - On company letterhead ??

PV4466

Registered Users (C)
My lawyers tailor-made an employment letter that they want my former manager(previous employer) to sign on company letter-head. My former manager sent me a letter on a normal sheet of paper (Signed, Dated and also has his phone no. and title as manager). Is there a possibility that USCIS wouldn't consider this letter as valid (because it isn't on company letterhead).

Thanks,
 
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