How to investigate the crime himself to the police?

The crime was committed against me personally. More precisely, against my car, Toyota Corolla, left at 12 o'clock in the residential area of the city near the grocery store. In a very crowded place, but this does not become safer.
Motive was the radio panel forgotten by me at her workplace. Here such I sloven, I confess. The panel has been kidnapped in the standard manner by breaking the right front window, a heavy, "unknown", as it was written later in the protocol, the subject.
Damage to his favorite car, I discovered immediately after the arrival of her half an hour after the incident. Yes, I do not have the signaling. Toyota old, for stealing is not pulling, and disturb the neighbors at night do not want to. So what about the damage caused by her silence, she said plaintively to me after viewing the first and grabbing his head and then a pack of cigarettes. 

Next, I automatically called to the scene, police. Phoned immediately and heard: "Wait." The question: "How much?" - The voice of the tube said that the group left the corpse in the central market. Then, if nothing happens, then to me. Wait near the car was depressed, and I decided to look for witnesses. Crowded place, stealing shamelessly. We first went to the store, which stood near the car. The saleswoman was talkative and told about a certain young man kupivshem pack of cigarettes "Kent". Upon further interrogation revealed that the young man was a junkie from a nearby house. Cigarettes, he borrowed and promised to pay in the evening.
Out on the street, I found near the car a few bulls from "Kent". It became interesting. I felt the excitement. Revenge pushed for further investigation. At this moment a young man approached and introduced himself in the civil local precinct. I put him the results of its preliminary investigation. At that precinct shrugged and said that he does not need to know. Soon will come the investigator-investigator, behold, they say, and tell him. Then the policeman with the words: "I'm going to look for witnesses," - disappeared into the nearest doorway. Most of it I have not seen.
Decided to continue the investigation on their own. Poll porter, carrying boxes of food in the basement of the store, showed that the criminals had an accomplice waiting for him at the old foreign car in black with numbers ending with the numeral 5. Loader saw a drug addict, who identified as Serega from a neighboring house, from which everything is already moaning sadivshegosya in this foreign car after the sound of impact. According to a witness, Serge quiet day. But then, apparently, it took a dose. I saw an unfamiliar car and ... But he does not touch his, that's for sure.
Me from such information has become much easier, and I phoned the duty unit. There again was advised to wait. Since the crime was almost solved, but to detain the suspect (by the time I already knew and the staircase, where he lives, and the apartment) I had no authority, had to wait for arrival of the investigator.
Somewhere in an hour came to an old broken down "Gazel". From it emerged two young girls and a man. A man who later turned out to Garik security officer as he was called investigator-investigator Lena, disappeared in the doorway in search of witnesses. One of the girls began to photograph the scene, and the investigator began to interrogate me.
I proudly admitted that in fact already have a suspect, and would be nice to spend his detention in hot pursuit. Lena, by the time we met, said Garik suit soon, and repeatedly asked whether essential for me harm.
Sensing a trick, I announced that the highly in response to that Lena, with a sigh response recorded. Then told me that working here for two weeks. Nothing good in this fucking work there, and the capture of another drug addict will not change anything. And anyway, they still have to go to the corpse at the Central Market. Proud that a crime against me, the operative group estimated higher than against the fact that the market, I have signed the protocol, and left.
Garik operative on the horizon and has not appeared. Hopefully, in the entryway, he found the missing precinct. Investigator Lena promised to call if the results will be. For example, a voluntary surrender.