<type name="forever_firewood">
<nominal>0</nominal>
<lifetime>3888000</lifetime>
<restock>1800</restock>
<min>0</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="0" deloot="0"/>
<category name="weapons"/>
<usage name="Military"/>
<value name="Tier3"/>
<value name="Tier4"/>
</type>

"forever_firewood,1,-1,-1,15000,5000,0",

These are examples, adjust as needed.
the price will be 15k sell for 5k and damage wont matter.

The types file makes it stay for 45 days without interaction. but does not spawn anywhere