You might want to wait for the case to be completely closed out as you would have a higher probability of success when all charges are resolved. However, if you want to pursue the matter at this time, you might begin by simply calling the police department, specifically the arresting officer. As the safe appears to be unrelated to any criminal charges, the officer may be willing to release it at this time.
If that fails, you might consider filing a motion with the court. You could file a motion for return of property arguing that the safe was seized as a part of the execution of the search warrant but, as it is not relevant to any pending criminal charges, it should be returned. If the judge agrees, he may order the police department to return the safe.
Please let me know if you need any clarification.
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