Question

What items are mentioned (or bought) by NPCs but still not obtained by players?

Like items that NPCs mention or even say they would buy, but no player has obtained yet.

Answer 1

Mystirious H.L is keen to buy few items which are "not obtainable" in game by looting or finishing quests:

Dragon Scale Legs- for 180 GP

 Horned Helmet for 155 GP

Golden Helmet - for 420 GP

 Winged Helmet for 320 GP

 Blessed Shield for 650 GP

 Shield of Honour for 520 GP

 Rose Shield for 49 GP

 Magic Longsword 460 GP

Warlord Sword for 360 GP

Rashid Would like to buy:

 Patched Boots for 2,000 GP

Yasir:

 Guidebook for 200 gp

​​​​​​​ Morbid Tapestry for 2000