Definition of "sarcophagused"

All waiting: the new-coffined dead, / The handful of mere dust that lies / Sarcophagused in stone and lead / Under the weight of centuries: / Knight, cardinal, bishop, abbess mild, / With last week's buried year-old child.

1862 April, [Dinah Maria Mulock], “Waiting”, in David Masson, editor, Macmillan’s Magazine, volume V, number 30, Cambridge, Cambridgeshire, London: Macmillan and Co. […], stanza 2, page 464

Was it the Mummy of King Cheops—still sarcophagused in the labyrinthine recesses of the star-y-pointing Pyramid, to mock generations of Egyptologists, past, present, and to come—that had all at once found a tongue within his desiccated jaws?

1876 January 8, “Preface”, in Punch, or The London Charivari, volume 69, London: […] Bradbury, Agnew, & Co., […], pages iii–iv

Even the sight of a very great king indeed, sarcophagused under electric light in a hall full of most fortifying pictures, does not hold him [a visitor to the Valley of the Kings, Egypt] too long.

1913, Rudyard Kipling, “[Egypt of the Magicians.] Dead Kings.”, in Letters of Travel (1892–1913), London: Macmillan and Co., […], published 1920, page 261