Cache of the Mind Flayer Slaves in the Eastern Tunnels

right after you free them, theres a dialogue with the Leader of Slaves and he mentions something about finding his Cache and giving you something from it as a reward for helping them. however, the Captured by Mind Flayers quest ends with no more clues or mention about that cache.
whats the deal, is it a thing, can it be found later on? or.. not?
whats the deal, is it a thing, can it be found later on? or.. not?
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Over the years, the conclusion was, this is either a cut or unfinished piece of content, or simply flavour dialogue that was never implemented.