The first was recorded in 2006 with an emphasis on acid house, bleep, Belgian techno, early rave and breakbeat. You can currently listen and download it here: simfonik.com/2008/06/dj-mojo-an-epic-oldskool-journey/
The second was recorded in ~2009 with a focus on UK breaks aka 'ardcore, proto-jungle and other similar genres. You can currently listen and download it here:
These mixes included well-known classics as well as many rarities. Mojo will continue on this path in the 3rd installment while slightly departing from the esoteric and adding more anthem flavors of oldskool techno.