Unfortunately, this is common. Dishonest, in MY HUMBLE opinion. As for trusted sellers, or ones that don’t do this, I generally try to buy from sellers that I’ve previously dealt with over the last 20 years of buying from Japan. One trick that I’ve found is to buy from a store that has a sizeable amount of listings that span different eras of the game, but are NOT all sealed, or high-volume. Basically, look for sellers that have stock similar to an Local Gaming Store or pawn shop, and of course, with significant feedback.
There are a few great JP sellers listed in the eBay Gold Thread.