From my comment in Chinese → English
I some found images on the web (⇓📷), those land hermit crabs had white body colour with transverse band in brown tone (hereinafter referred as specimens). I thought these specimens were Coenobita pseudorugosus.
According to Nakasone (1988) < Land Hermit Crabs from the Ryukyus, Japan, with a Description of a New Species from the Philippines (Crustacea, Decapoda, Coenobitidae>, walking legs of C. pseudorugosus with a dark brown band or stripe.
These specimens were always regarded as juvenile Coenobita perlatus.
I compared colour in life of juvenile C. perlatus in the wild, most of them with full of orange or red body colour, some of them with transverse band in orange tone, not that kind of brown bone.