Book V. 1013. Obviously from Guido; the passage follows soon after that

last quoted. 'Associauit [Diomedes] eam vsquequo Brisaida recipere in sui patris tentoria se debebat. Et ea perueniente ibidem, ipse eam ab equo descendentem promptus adiuit, et vnam de cirothecis[57], quam Brisaida gerebat in manu, ab ea nullo percipiente furtiue subtraxit. Set cum ipsa sola presensit, placitum furtum dissimulauit amantis.'

For this incident of the glove, cf. allit. Troy-book, l. 8092.