Originally Posted by
qwaalodge
The cassette looks like it's never been used.
It also seems dirt cheap Chinese bolts and screws have good quality because they never rust.
The rust likely came about when it was ridden the one time it was exercised & wore off the chinesium coating off. The hardware that is not rusting might be from never being touched with a tool to scathe the chinesium coating off; which would mean it never was serviced.