Yep, they will ship it in a bubble mailer. Mine came in reasonable condition with one dent on side
Had the same issue with my SE. Got a follow up e-mail from Rakuten a few days after it arrived and I responded honestly about the dented corner and that it mailed in a bubbler mailer. Customer support asked for a few photos. Sent those over and then got a phone call asking if I'd take a $20 refund to my payment method as a solution.