In a later interview in 2008 covering the third set in the series, Green Grocer, the designer indicated that sales had been strong enough to support four sets in the series (referring to the planned 2009 release of Fire Brigade as the fourth set).
而后来在2008年的一次关于第三款产品——绿色杂货店的采访中，设计师表示其销量已强大到足以支撑第四款同系列产品（意指计划在2009年发布消防队作为第四款产品）。