From Fallen London Wiki

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The weekend Rat Market also offers the Reported Location for 15625 Rat shillings once in a while.

You can also get what you want from the Relickers if you have accumulated a lot of Scraps.

<a rel="nofollow" class="external free" href="https://fallenlondon.wiki/wiki/Category:Relickers">https://fallenlondon.wiki/wiki/Category:Relickers</a>