Ingerprint Identification: Three Latent Print Scenarios

You process a murder weapon in a homicide case, but dont develop any prints of value for identification on it what does this mean?

Or, maybe you do develop a print of value for identification on the weapon, but it is not identified to the suspects prints. What does this mean?

The third scenario, you conclusively identify the suspects prints (and they are all verified) on a latent lift card that was recovered from a table inside the murder scene. What does this mean?

What can you conclusively determine or say in each of these three scenarios, if anything?