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When 'duty' is a noun, non as a prefix can be said to have been used adjectively. When 'duty' is used first in the expression 'duty paid', the former is a noun, the latter a verb. Compound nouns are accepted in English language and some verbs used in participles are used as nouns. The common prefix of negation as Black's Law Dictionary also say, for which the word 'non' stands unless extended to the expression 'duty paid' carries not much sense as 'non duty' in that event will mean no duty and the words 'non duty paid' will only mean when no duty has been contracted to be paid.