Actually, if Papyrus 470 is as old as the 3rd century as some believe, the Marian prayer in it would be roughly contemporary with this scroll:
https://www.digitalcollections.manchester.ac.uk/view/MS-GREEK-P-00470/1
That scrap you gave translates:
“Beneath your compassion, we take refuge, O Theotokos: do not despise our petitions in time of trouble, but rescue us from dangers, only pure, only blessed one.”
Theotokos = Mother of God
The silver item with the person buried in this article said nothing about Mary.
There is no parallel.