I have a copy of a Hong Kong movie that seems incredibly rare and hard to find. I tried looking for legitimate copies on Amazon, eBay and YesAsia and failed, so it's been impossible for me to check my copy against those by licensed companies. Trouble is I don't even remember where I bought my copy so I'm out of luck. I'm pretty sure it was from a big name company like YesAsia, though. Presumably they don't sell bootlegs (correct me if I'm wrong). I just want to know if it's genuine or not so I can resell it on eBay since I don't want it anymore.

I know a lot of bootlegs do come from HK, but if the movie itself is a Chinese language movie produced in HK, then how do you tell a legit DVD from bootlegged ones?