freelander 2 satnav update? genuine or copy?

[layercake]

guys, i have been asked by a friend of mine who doesn't know much about this, hes looking to update this maps and told me he's found a genuine disc for under £30 ! now i found that hard to believe, no one sells even a used genuine for that price, he did message the fella selling it asking and no reply , even tho this listing states its OEM, .. what do you chaps think?

http://www.ebay.co.uk/itm/LAND-ROVER-FREELANDER-2-...
LAND ROVER FREELANDER 2 LATEST SAT NAV UPDATE MAP DISC