What do these stage directions reveal about when the opening scene takes place ?

It takes place after the Franks have been captured.

Explanation:

The Franks and the others hiding in the Secret Annex were caught by the Gestapo, on August 4, 1944, and sent to concentration camps. The curtains in rags and furniture overturned seem to reflect that that event has already happened.

Otto, Anne Frank’s father, was the only one who survived and was freed from Auschwitz by Soviet troops on January 27, 1945.

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity