In the Livonia Vanilla Types file [From Bohemia's Github] Firewood has been set to spawn at clothing spawns anywhere on the map
<type name="Firewood"> <nominal>5</nominal> <lifetime>14400</lifetime> <restock>0</restock> <min>3</min> <quantmin>-1</quantmin> <quantmax>-1</quantmax> <cost>100</cost> <flags count_in_cargo="0" count_in_hoarder="0" count_in_map="1" count_in_player="0" crafted="1" deloot="0"/> <category name="clothes"/> </type>