Petr writes that people go to Poland after five days at Veletrzni. Veletrzni is the old Trade Fair Palace, a large space where people came for processing and stayed until moved out. See ://www.prague.net/veletrzni-palace/.
Names of concentration camps are not given in Petr's references. Here is a directory of all of them,the camps, their use at the time, their status now. www.jewishvirtuallibrary.org/jsource/Holocaust/major_camps.html.
You will probably not find Auschwitz, on a Polish map, or Theresienstadt on a Czech map. You will find the national language translation, not the German: Osweicim PL or Terezin CZ, the camp reflecting now the language of the country itself, not the earlier invader. Try many spellings.