Acts 1 and 3 are unlabeled in the text.
"A Discourse of Life and Death, by Mornay; and Antonius by Garnier"
Philippe de Mornay Robert Garnier
The walls were lined with bins, all unlabeled, filled helter-skelter with every imaginable kind of gadget, most of which would have been hard to recognize unless you were both an expert and a historian.
"Unwise Child"
Gordon Randall Garrett
Their ancient marks were gone, and their bones alike-uncertain, unlabeled, indistinguishable.
"The Best of the World's Classics, Restricted to prose. Volume I (of X) - Greece"
Various