No problem.
As always, if you're unsure, a couple photo's of the case and discs would be helpfull as there are a few tell-tale signs of a fake (Like calling it Dragon Ball Z rather than Super lol)
Few things to check
- Ebay Listings. Not the best but if a bunch of people are selling the same DVD with a bunch of pictures in the UK, then its more likely genuine. (Well... Hopefully)
- Anime News Network lists ISBN's along with basic info of all (?) English releases. If your DVD matches that info, again likely genuine (well, hopefully). If you have a single DVD Boxset that claims to have all Seasons 1-10 when ANN doesnt list that as an option... Well maybe less genuine
I would mention about DVD-R disks being an easy spot but Media Blasters is a thing sooooo... Yeh