Rating:
Parcel was zipped file, that after unzipping contained list of multiple emails with different base-64 encoded attachments. Attachments could be recovered manually, via script or via some tooling to recover mail attachments.
Later it was only about putting pieces together in paint or photoshop
https://github.com/lasq88/CTF/blob/main/ritsec2021/forensics/parcel/puzzle2.PNG
