The Quickly De-coloured 100th Anniversary Hotshoe Cover

A Xitek Pentax user complains about his brand new O-HC171, which was purchased from official Ricoh channel, has turned its colour from silver to black just within two days after he removed the protective film of it:

https://forum.xitek.com/thread-1896215-1-1-1.html
(in Simplified Chinese, Google translation to English here)

And, another Pentaxian in the above forum thread reported that his O-HC171 had also turned dark.

Seems like oxidation took place. What a Quality of Ricoh! :-o