Squirrel Cache:
Anyone: Was there a way to also show empty squirrel cache's on the map. (have not tried custom radar icon yet)
Ender: Not sure you know about this. But the Squirrel Cache fullness state only reflects how the last player left it. (looking or draining)
Or: There are only auto-refiled (presuming some server-side trigger) when a player actually "looks" into them. So an empty one might actually have items in them the moment a player looks into it.