Gun siezure in las Vegas nv, gun taken no record left by officer.?

A man and his cousin are stopped near the strip,told that their registration is suspended. The men and vehicle are searched, they tell the officer that there is 3.5 grams of weed in the backseat. There are also two legally owned and registered guns in the trunk as well as the blue card for one of the guns. After being held and questioned by undercover cops for +2 hrs, about snitching on some dealers? the men are released, given a citation for the reg on the car. The undercover police take the guns, card, marijuana and tell the man that he has 48 hrs to contact them with info on someone else or else??? Neither man is on probation or parole, neither is a felon or criminal, but one (the gun owner) had charges that went to trial and he was acquitted. The police obviously saw this on their computers. no officer ever cited or documented the marijuana possession, and no record of the weapons being taken was issued. The men went directly to an attorney, who was baffled, contacted the undercovers, told them he had no info for them, told them the ball was in their court so to speak. They would not talk to her. The next day, the guns turned up in evidence, after many phone calls/ messages. The citation has a place where the issuing officer can mark down whether or not there were drugs involved, they did not do so. How do they get the guns back. There was no crime involving them. Btw... The registration issue was DMV error, and is thrown out.