I noticed CZ527s weren't spawning on my Sakhal server and then saw the "shelves" tag in types.xml and thought this might be the culprit?
<type name="CZ527">
<nominal>25</nominal>
<lifetime>28800</lifetime>
<restock>1200</restock>
<min>20</min>
<quantmin>30</quantmin>
<quantmax>80</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"/>
<tag name="shelves"/>
<usage name="Farm"/>
<usage name="Hunting"/>
</type>