The existential quantifier 任何 ren4he2 ‘any’ can appear in DET and the nominal phrase either represents a free choice or an item in a non-affirmative context.
A free choice 任何 indicates that an arbitrary subset can be selected from a known set and the predicate applies to that subset. For example,
fu4kuan3 hou4 gu4ke4 ke3yi3 na2zou3 ren4he2 yi1 kuang1 yu2
pay_a_sum_of_money after customer may take_away any one CL fish
‘The customer can take away any basket of fish after he has paid the money.’
A non-affirmative 任何 appears in the scope of negation.
kao3shi4 qi1jian1 bu4zhun3 ren4he2 xue2sheng1 li2kai1
test period forbid any student leave
‘Do not let any student leave during the exam period.’
Shi, Dingxu. 2016. Nouns and nominal phrases. In A Reference Grammar of Chinese, eds. by Chu-Ren Huang and Dingxu Shi. Cambridge University Press.