I support this idea.
The only problem i could see with this.
Is that people would have different time lines and thus are never able to picklock the chest of a certain person.
Or that if the person suspects anything he would just log out for a minute or 10 so the thief cannot do anything, and in that time the person being stolen from calls upon people to go ingame for them or something.
It can be abused in ways like that but.
For the rest i like it.