It is understood to have been delivered to the general office at the court before being identified as potentially dangerous.
Emergency services were scrambled to the court at 11:44am following reports of a "suspect item of mail".
Police, fire and ambulance incident response units attended the building on Oxford Row in Leeds city centre.
The building was not evacuated and many of the courts continued to function as usual.
A West Yorkshire Police spokesman confirmed the item has now been deemed safe.
The spokesman confirmed the incident is now being treated as a 'malicious communications'.
Robinson – whose real name is Stephen Yaxley-Lennon, was jailed on May 25 by Judge Marson for alleged contempt of court.
He was arrested, charged and sentenced for filming people at a grooming trial in Leeds and live-streaming the footage on social media.
The trial was the subject of a court order banning reporting or broadcasting of the proceedings to prevent prejudicing linked trials.
Right-wing protesters had claimed that the non-reporting of the trial was part of an establishment cover-up of Asian paedophile rings.
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