As far as i have monitored it, not much are interrested in white bones - so if i find someones colored bones, i lock them down in the house and will only hand it out if the char with that name meets me so i can hand it personal
On the other side, yes your right, there will always be some black sheep, but than, i can eject them from the house if i catch them - so dont dare peeps!
As far as i noticed, the boxes are yet well used, so spread the word and i guess alot of people will be happy!