Copyright Rick Menges, with my thanks
Here's the description from the MFA website:
Egyptian, Greco-Roman Period, A.D. 50–100
Height x length: 46.6 x 63 cm (18 3/8 x 24 13/16 in.)
Classification: Tomb equipment
On view in the: Egyptian Funerary Arts Gallery
Footboard depicting the mummification of Osiris by Anubis. Two mourning women, representing Isis and Nephthys, stand at either end of Osiris. There is a vertical strip of hieroglyphic text in both upper corners; however, their meaning is not fully understood.
Museum of Fine Arts, Boston
Egyptian Special Purchase Fund, 1979
Accession number: 1979.37
Provenance/Ownership History: December 14, 1979: New York sale, Sotheby Parke-Bernet, sold to MFA.