I'm using the guide and media from the amigaunix.com webpage.
http://www.amigaunix.com/doku.php/installation
and the files linked directly on that install document.
The tape .zip contains index.tape and 00 - 28 files
filename: amix_21_tape.zip
md5: f73ce4962a00e6818ea956d11b8b1429
Not surprising the hash doesn't match yours, Noth, as different filename and archive type (.zip vs .tar vs .7z)