I've asked this question to a guy who worked 15 years in Honda Mozang Road and now running his own workshop at Jail road with some show room.
He said Honda Never import the oil filters from Japan or from other countries. They just purchase it from domestic companies and tag Honda on it.
But people believe these are original, and hence nothing can be done further.
Also, my friend who runs an oil shop, receives 1 example in every 3 months especially for the oil filter of OEM. When he take out the filters from Toyota or Honda, the condition of filters are very bad. And most people said they bought from dealer, Metro or hyperstar.
Purpose is not to prolong the discussions with different arguments. But just uncovering some realities.