Two autograph musical quotations signed, mounted together on matboard, Covent Garden and location unknown, 1891 May 19, undated but after 1880

Quotation 1: 3 measures from Manon, act 2, with the singer's name, Miss Sibyl Sanderson, added parenthetically by Massenet. Signed and dated by the composer "1ere rep: Covent Garden, London, mardi 19 Mai 1891".
Quotation 2: 3+ measures from Massenet's rendition of "Le sais-tu?" in G Major, lyrics from a poem by Stéphan Bordèse. No location noted and undated, though the song is recorded as having been composed and published in 1880.