Just simply :" Please find enclosed.."(I think this is more up-to-date) enclosed herewith sounds abit old fashion...or I have enclosed the documents as you requested.
Though, according to The Oxford Dictionary of American Usage and Style
: enclosed please find; please find enclosed; enclosed herewith; enclosed herein. These phrases—common in commercial and legal correspondence—are archaic deadwood for here are, enclosed is, I've enclosed, I am enclosing, or the like. Interestingly, business-writing texts have consistently condemned the phrases since the late 19th century:
• “[Please find enclosed:] A more ridiculous use of words, it seems to me, there could not be”.
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