Well I just tried your chest protection out and as before, when using the plugin on an existing server, only the admins can remove any of the chests that were set before the plugin was installed. No regular player may remove any chest that was placed before the plugin was installed. On old servers with hundreds of claims, this is unmanageable for the admins to remove every chest so every player may replace the chests so they may lock them. It also makes picking up chests in the ruined huts and the pyramids impossible. This plugin, in my opinion, is only good for new servers or small servers that have very few chests placed. I tested this out on my server and had to remove it because of this fact.
to stress the point let's do some math.
100 players with 10 chests each make 1000 chests to replace.