Yeah, I think you’re right.
So, for the OP, this works:
"Test1" by "J. J. Guest"
Desert is a room.
A sack is in the desert. The sack is a container. The sack contains a goblet and a skull.
The exclude indirect possessions from take all rule is not listed in any rulebook.
Rule for deciding whether all includes things enclosed by the person reaching while taking or taking off (this is the new exclude indirect possessions from take all rule): it does not.