Cf. Harrison, Jane Ellen, Prolegomena to the Study of Greek history, Chapter II, "The Pithoigia", pp.42-43. Cf. also Figure 7 which shows an ancient Greek pot painting in the University of Jena where Hermes is presiding over a body in a pithos buried in the ground. "In the vase painting in fig.7 from a lekythos in the University Museum of Jena we see a Pithoigia of quite other and solemn booty. A large pithos is sunk deep into the ground. It has served as a grave. ... The vase-painting in fig. 7 must not be regarded as an actual conscious representation of the rupent rite performed on the first day of the Anthesteria. It is more general in content; it is in fact simply a representation of ideas familiar to every Greek, that the pithos was a grave-jar, that from such grave-jars souls escaped and to them necessarily returned, and that Hermes was Psychopompos, Evoker and Revoker of souls. The vase-painting is in fact only another form of the scene so often represented on Athenian white lekythoi, in which the souls flutter round the grave-stele. The grave-jar is but the earlier form of sepulture; the little winged figures, the Keres, are identical in both classes of vase-painting."
Cf. Jenifer Neils 2005, p.41 especially: "They ignore, however, Hesiod's description of Pandora's pithos as arrektoisi or unbreakable. This adjective, which is usually applied to objects of metal, such as gold fetters and hobbles in Homer (Il. 13.37, 15.20), would strongly imply that the jar is made of metal rather than earthenware, which is obviously capable of being broken."
Meagher 1995, p. 56. In his notes to Hesiod's Works and Days (p.168) M.L. West has surmised that Erasmus may have confused the story of Pandora with that found elsewhere of a box which was opened by Psyche.