Important Information:

Provided is a recording found on a USB stick sent to the police station.
The only other content inside the envelope was a note saying "it wasn’t me!", and the envelope had no return address.
The only file on the USB stick was the audio file of the recording.
We're fairly certain the first voice is that of Chris Hodgson - as for the second voice, we're unsure. We're going to analyse it further, but it may take a while.

Officer B. Lunder from the data transfer department has notified us of an error on his paperwork.
In the “Record of Communications” document, inside of the case file, telephone number 555 8407 should be ignored.
This is the telephone number for Officer Lunder’s chiropodist, which he entered as placeholder text and never replaced with the correct number (555 9712).
Lunder sends his apologies. Furthermore, he was able to confirm that the number ending 9712 belonged to a “Ms S Taylor”, although he is still unsure who’s phone these messages were originally taken from.
He’ll update the files as soon as he has more information.