I just had trouble finding the 6th one as well. It looks like there is a key in each room, 4 up top and 2 below. I had trouble seeing the key next to the pot in the dining room. If you hold tab as you move through the room all clickable items will be outlines.

I've found six though. There's no seventh. You're sure I don't need to finish the Disk quest to get that one?

You only need 6. One is already in the thing when you get there.

Okay, then I'm still missing one! I have scoured and scoured those rooms, with tab held down and literally clicked beside/on everything. Madness.

Hope this helps)

Arthu's Mansion, 1st floor, right wing:

1st key - dining room, table.
2 - storeroom, wooden table.

Arthu's Mansion, 1st floor, left wing:

3 - bedroom, canopy bed.
4 - library, table with a vase (a fat Umbrage guards it; it seems you can't avoid a fight).

Arthu's Mansion, basement:

5 - empty shelf.

Arthu's Lab:

6 - table in the center of the room.

Note: Lab is behind a mirror in the basement.

After you get all 6 keys, put them into the mechanism - right into the notches, one by one.

Thank you Allvarres84, unfortunately, I triple checked all on the list and there's nothing. The Arthu's Mansion Basement with the empty shelf, I get the "pick up hand" near the mirror on the ground and on the table, but there's nothing to grab. I wonder if maybe the empty shelf one didn't spawn. The issue is that it has been two week since I grabbed all of the five original five and I cannot remember when I found stuff exactly. Who knows, but it has kind of put the games completion on a standstill.

Strange... seems a bug. You simply can't miss it in the basement. Top wall, empty bookcase near the mirror, second shelf from the floor, you see it right when you enter.

I also met this "pick up hand" you mentioned, it was useless and later disappeared, due to patches or whatever. Heard they had a problem with this mirror - it wasn't active or sort of - but later it was fixed. And it was about two weeks ago.

Really disappointed. I've given it a few weeks, hoping something might be remedied for the missing key. I have clicked every pixel in Arthu's Mansion. The far left key is not in that building. I would love to finish this game.

@kyle.sanker Hi! I think your save will help to figurate out where problem it is. Hope you can send it to us in our discord channel:
https://discord.gg/ttzqgH8
Best regards.