There are no regular auctions- that 'trade' is highly restricted and rare. As Saar told you, it's a relative minuscule number of people that are into it. Nearly all of that Sith stuff is long lost to time.
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Check who up and check were who tried to break in, Denz? I think I know what you mean but I'm just making sure. Pronouns can be a pain.
It was a business property that he owns on Telnan III. But there';s nothing there now- the Jedi already checked it out when bringing the murder case against Saar. If there was ever anything interesting there, it got moved out long ago.
Someone can try and brute force clues to this one if you want to make skill rolls based off something to do with the means by which he makes contact.
Howveer, Elzair will tell you that he was always moving his collection. Lennah was a very paranoid guy. He designed all that security himself; he's a maths genius., Kind of a Steve Jobs type- he isn't just a businessman. He's a techo guy himself who started his fortune by flogging his own products.