These words mean "to shut in," "to close on all sides," "to surround," and "to insert": "High mountains enclosed (or inclosed) the valley." "Enclose (or inclose) a check with your letter." Enclose is the preferred spelling. So is enclosure rather than inclosure. Expressions such as "enclosed herewith" and "enclosed herein" are wordy because enclose conveys the idea of herewith and herein."Enclosed please find" is a piece of business jargon not only wordy but also silly. Say, rather,"I am enclosing...."
Dictionary of problem words and expressions. Harry Shaw. 1975.