So I had my Miroku at negotiation level 5, and sometimes he sold useful magatama like dusk and amara.
A few days ago I lvled him up a bit and his negotiation raised to lvl 6, but now all the magatama he sells are those useless ones with rank 8+ and 9+ skill force.
I was just wondering if I'll keep getting those or if the dusk and amara magatamas might still show up.

Nope. He has a specific table for each negotiation level. There are a few items that show up across various levels, but for the most part, magatama are only on one level.

Thanks for the reply.
Guess I'll keep that in mind for my alts.