This is the latest I've been able to find on the mysterious Joseph Mifsud. From Fox report, an audio recording in 2019 was sent to an Italian publication.

Last known image of him is taken from 2018

Zurich.

"Fast forward to 2019, no official has concluded exactly who Joseph Mifsud is, despite him being highlighted in Robert Mueller’s final report 89 times."

https://www.foxnews.com/politics/joseph-mifsud-audio-russia-investigation-disappearance