[She thought so. If this was L, then he should have already known what Misora had been up to prior to the abduction. However, if what that kid said earlier about the different timelines had been true as well, it would make sense them for him to ask about her last memory. In which case ...]

I had just finished unofficially wrapping a up a murder case. [Should be no harm and letting that information slip. Keyword there was "unofficially." Misora had been on leave of absence at the time of the LABB murder cases, so it shouldn't be difficult for L or those in the FBI to figure out what specific case she'd be talking about.]

If you are who I think you are, please tell me what that case was.