Suppose someone stole something prior to converting to Islam. Further, suppose they are still in possession of the thing they stole. What should they do with the thing they stole?
The consensus seems to be that their pre-Islam sins are forgiven. However, this does not seem to grant ownership of the stolen object.
I'm not sure what would be the appropriate action here. If they try to return the object, they might get in trouble. Alternatives are throwing it away or giving it away.