Hello nsmp,
Perhaps you gave up too easily? In the help instructions it clearly says:
You may be able to get objects from or put objects in a container type of object eg:
>put rope in rucksack
>get knife out box
One or two other players have mentioned about having trouble with container objects though, so I have posted another new update at 10.00am GMT this morning 11 Jul 2021.
Now when you see a description of an open container that holds object(s):
In the desk is: a receipt, Clark's jotter and a newspaper clipping.
You may now acquire an object inside the container by typing :
>get receipt
or
>get the receipt from drawer / get receipt out desk
or
>get all out desk