This window box works very well with its water storage, unfortunately the principle of moisture management is explained on textile loops in any instruction manual, so maybe some suspected a kind of transport safety in the whole and removed so that it does not work merh. Also on the necessary drilling in holes is noted only on a hidden part. For the balcony box newcomer also an indication would be helpful if you should only fill the earth or a drainage layer (eg expanded clay) makes sense.
