The photos, released Thursday, came from rolls of undeveloped film that were recently discovered during a review of the case file, police spokeswoman Renee Witt said.
However, Witt said the photos revealed nothing that would be considered game-changing to the case.
One picture shows a box with a spoon and what appear to be needles on the floor next to half a cigarette and sunglasses. The second photo shows the paraphernalia box closed, next to cash, a cigarette pack and a wallet that appears to show Cobain's identification.
Police reviewed the case in anticipation of questions in connection with next month's anniversary, Witt said.
"There's still a lot of interest in this case," Witt said. "The detective went into the case files to refresh himself. The outcome of the case has not changed."
Many refuse to believe that Cobain committed suicide, thus birthing conspiracy theories that he was killed.
In a statement on the Seattle Police Department's online blotter, the detective who re-examined the case dismissed that speculation.
"Sometimes people believe what they read_some of the disinformation from some of the books, that this was a conspiracy. That's completely inaccurate," said Detective Mike Ciesynski, who found the four rolls of undeveloped crime-scene photos. "It's a suicide. This is a closed case."
Cobain's body was discovered in Seattle on April 8, 1994. An investigation determined that days earlier Cobain had gone into the greenhouse of his large home and taken a massive dose of heroin. He then shot himself with a 20-gauge shotgun.
Earlier that year, Cobain had tried to kill himself in Rome by taking an overdose of tranquilizers.
Cobain, who was 27 when he died, sold millions of albums with Nirvana and helped popularize the grunge rock genre.
The Associated Press contributed to this report.