No issues importing, asked the seller to write my ukara all over the box and got stung with a little customs charge, but that was to be expected. The only faff I had to deal with was the seller themselves not shipping it after a month of me pestering them.
I've been going to Japan near enough twice yearly since 2018 (with the exception of those obvious years) and sent guns back home every time, even if your ukara information isn't on the box etc, border force will contact you to do all their checks so I haven't had any issues in that time.
IKEA special 😎 unfortunately that carpet doesn't exist anymore after my doberman decided to shit all over it lmao