Not the easiest thing to do when everything is spread everywhere like a mad freebuild, 50 different people built something and your own stuff is not on a baseplate.
Are you hinting at Badspot's Block Party?
No, because on the blockparty everything is put on a baseplate and you can easily dupe your build, clear ALL the bricks and place the dupe down when it's over.
Can't you save the build with ownership, reload it onto your server and load the ownership, then just clear everyone else's bricks?
Or use buildbot to just save the duplication and not forget around with everyone else's bricks
If it's a freebuild it's fair to assume there are over 40 unique ID's most of whom have built something, even just a few bricks.
Buildbot sounds gay, what is it?
It's not.