I don't know what you mean by "how do you know"? You know what's written in the restraining order, what you've been forbidden to do - so either you've broken it by doing that thing, or you haven't.....
If you have broken the order and someone has reported it then the police should warn you or if it is a serious breach arrest you.
Yes, you can make money selling on ebay but you need to have the stuff `to sell first.
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