I remember when it happened. The ISS made a pass almost directly overhead at the time, so I went out to look at it with my binoculars, and damn if I didn't see the tool bag!
It was too dim for my naked eye to see, but it was unquestionably there in the same field of view of my 7x50 binoculars as the ISS, and preceding it in orbit. From the linked article, it sounds like it's drifted further away now.