I am curious for years over several explorers there are few locked doors/chests that afaik no one has ever opened. I am wondering if there are actual keys for them or there are bugs in the system?

In forgotten crypts...

Massive Doors on first sublevel
Locked crypt

In mansion of twilight...

Two doors in hallway when first you enter
Locked crate by commander

I am just wondering if these are all able to be unlocked?