The man sighs. "Ma'am, as I said, I don't have the authority to insist, and I can understand if the explanation is a Skill that you'd rather not disclose, but then you will need to disclose the full circumstances of this to somebody, probably the Guildmaster in person. It's a serious -"
They're interrupted by an intrigued-looking woman in comfortable sorceress robes, who picks up the guildplate with a rather skeptical look, and chants, "I offer three-tenths of an offering of mana to the spirits of detection and analysis to scan the composition of this target and report on the average densities of its elemental components, along with the variances of their spatial distributions."
A moment later her skepticism shifts to shock. "I confirm pure orichalcum. What the actual hell?(*) There aren't any SS-ranks in this kingdom!"
"Adventurer Bella was just saying that she found this buried next to a stream, with no signs of a fight," the man offers.
"How'd she run across it then?" says the woman.
(*) Lit. "Why is there a dragon inside my house."