actually no they do if you're busted.
the term "AWAITING FOR CUSTOMS PRESENTATION" ever rang?

also MFW soraoto bunny girls being sex dolls

tldr: luck.

1. Most shop sell bootleg except some famous good one like the one in Berjaya Square which focus on Japan anime product/figure (forget the name)

1. You buy something deemed indecent from online stores. It could be H-tankoubons, doujinshis, whatever. Then you pay extra to have the seller make the parcel/packaging as "innocent" as possible.

2. You went to Comiket, and bought one (or dozens) too many doujinshis and merch. You're most likely way over your weight limit, and you can't fit all of them into your luggage. You pack them up real nicely and securely (though considering the sheer quantity, you can't cover them up 100%), and have a Japanese courier send it back to your home.