List of Free (Main Campaign) Adventures

Thank you, that's clear. I asked about the club membership because you originally did not mention whether it was allowed for or not in your numbers. Not everybody will automatically assume it is. I've found assuming things, especially on the internet, quickly leads to unfounded rumors and folk tales about game functionality. Better to ask for further info.

 

In one of the threads about gold chests not giving a Rare, I was told campaign chests only guarantee Uncommon, and so I checked my notes, saw that I always got at least one Uncommon, and I didn't look any further.

One advantage to taking notes is that I can go back and look again now. So...

Level 2-5 dungeons: always gave at least 2 Uncommons
Level 6 dungeons: often have 3 Commons
Level 7+ dungeons: at least 2 Uncommons
Note: I only have 1 or 2 data points for each level 7+ dungeon

Examining the secret adventure spreadsheet, it looks like five item chests (Garnet and Batford) should guarantee 3 Uncommons, and that Slub'Gut should occasionally give 3 Commons.