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It literally took me years to identify the cancel
Here is the basic "APPRAISER'S STORES" handstamp. I will eventually update this with a better processed scan of the actual handstamp.

It is identified as San Francisco Type 3.
According to Lou Alfano, who authored an article about Custom Cancels for The American Revenuer, "The "Appraiser's Stores" was the name given to government warehouses where merchandise was taken to be examined by Customs so that the proper duty could be assessed thereon."
This handstamp is known on four of the 1st issue $1 revenues.
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Your next challenge: Find either stamp (not necessarily with this particular cancel) on document.
I have never seen any of the San Francisco customs cancels/markings on document. Stamps with the handstamps are not particularly difficult to find, but never on document. I would certainly be interested in any scans folks may have showing the documents.
Discussion for another thread, but these and the San Francisco "Deposit/Duty/Excess" and New York "LIQUIDATED" markings aren't technically cancels.