The article mentions the royal steward's tomb at Silwan. The name there is damaged, but could be restored as Adoniyahu. In other words, it could be the tomb of the owner of this seal. At least that is chronologically possible. A past post on the royal steward's tomb is here.
And for many, many past posts on the Temple Mount Sifting Project, which discovered this seal, start here and follow the links.
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