I use OnDissolveBox,also I re-done the system for the Vital Apparatus Vent for my maps so it's not as complicated.
You can use a filter yes. that could mean that you will need to use a trigger_muiltiple ?
If you're using a filter, you'll need to make two portal_cleansers... one that excludes boxes, and one that is specifically for boxes, and you could use OnDissolve, instead of OnDissolveBox, this way you can set the filter to Box_* and not be limited to the names of your boxes....
I can't see why you would multiple names for boxes in your map. You only need one prop_physics (named box) and one point_template for all the droppers in your level. Just make seperate env_entity_maker's for each dropper all using the same template. This also avoids many problems with box destruction control and lost boxes.
Well consider a puzzle where something besides a box needs to get respawned. Could be a radio, could be a sphere, could be anything. The fact that limiting the only thing the portalcleanser will be default send an I/O for for named "box" is limiting, period.
On your respawn template, use the output "OnOutOfWorld" to trigger a new item to be respawned.
Does OutOfWorld trigger when it gets fizzled, really?
I did not get the OutOfWorld to work either...
I use triggers with filters_name or whatever they're called...
OutOfWorld triggers when the entity enters the void (black abyss) outside of the map. You would put this on the actual item (box, sphere, etc) and have it spawn a new one as well as kill itself.
OutOfWorld is a failsafe really, if you have a door or something blocked by a box and goes and pings through a wall into the void then OutOfWorld should trigger.
personally I use two portal cleansers each one unit thick - one for everthing but boxes and one for only boxes. The one for boxes has a trigger of onFizzle.