Likely he will need to have an Attorney file a "writ of replevin".....
The following info on return of firearms is from OPD:
My weapon is in the possession of the Omaha Police Department, how do I get it back?
There are several steps in order to have a firearm released from the Omaha Police Department Evidence Property Squad.
* You should start by contacting the Firearms squad at 444-6878.
* You may also receive a letter from the Omaha Police Department indicating that the firearm is no longer needed as evidence and you should start the process to retrieve it from the Omaha Police Department. If the firearm is evidence in any matter, it will not be released until such time that it is no longer needed as evidence. The investigative unit will determine this and complete a release form which is then sent to the Evidence Property Squad.
* Once the firearm is not needed as evidence any longer, Nebraska State Statute 29-820 requires that a court order, generally a writ of Replevin is required prior to Omaha Police releasing the firearm. Information packets concerning replevin actions can be obtained from the Douglas County Courts, phone number 444-5425, or you may contact a private attorney for assistance. The court order will need to be presented to the Evidence Property Squad or the investigative unit in charge of the case. The only exception to this rule is when a stolen firearm is recovered and no longer needed as evidence.
* Once the above two items are completed, you should contact the Evidence Property Squad of the Omaha Police Department at 444-5848 to schedule a time to come to the Omaha Police Department Central Headquarters located at 505 S. 15th St to receive your firearm. Bring a picture ID, any permits and/or registrations that you may have as well as the court order. Additionally, it is a good idea to bring a gun case suitable for the firearm that you are picking up.
* Once at the police department, your background will be checked to ensure that you are not a prohibited person and can lawfully possess a firearm. The firearm will also be checked one last time to ensure that it is not reported stolen or needed for evidentiary reasons. Lastly, concealable firearms will be checked to ensure that they are properly registered with the Omaha Police Department and if not, you will be required to register them at that time.