Pertinax,
I thought I had it with "What Africans Got For Their Slaves" by Stanley B. Alpern. It contains most of the items contained in the mystery text, but is only some 39 pages. See his Note 2 for more sources of slave trade goods. The mystery book is likely on his list. I was going to try to track him down and ask, but he died in 2024. Even the book Royal African Company by Davies has enough pages, but not the same reference format or text.
https://www.jstor.org/stable/3171906
Good luck,
Ed