Questions & Answers about Der står allerede en flyttekasse ved døren.
Yes and no.
In Der står allerede en flyttekasse ved døren, der works like the there in English There is/There stands... It introduces the existence or presence of something.
So here der is not mainly about a physical location. It is a grammatical dummy subject or formal subject.
- Der står en flyttekasse ved døren = There is / there stands a moving box by the door
- The real thing being talked about is en flyttekasse
This use of der is very common in Danish when introducing something new into the conversation.