I have boxes:
CN-6800, 11spd (Ribble?)
IG-51, 8spd, (bought from China Ebay)
HG-73, 9spd (bought from China Ebay)
All thee chains list on the box:
"Product of Japan / Fabrique Au Japon"
I see no notes of anything other than Japanese Shimano production, other than not using the word "made".
One never knows the truth about Chinese grey market products.