The lack of further chips might be explained by the design of the gearbox, which up until that time had a series of powerful magnets mounted on a shallow conical tray just beneath the epicyclics. Almost immediately thereafter the factory ordered all such magnets removed and I saw with my own eyes when this was done.
What were those magnets for? Possibly to catch the bulk of metal particles thereby preventing damage to components lower down the gearbox. I guess the philosophy was that at least one or two particles would pass through the ring of magnets and reach a detector lower down, giving enough warning of an impending problem at the top of the gearbox. This actually happened and yet the factory somehow allowed REDL to continue flying.
The reason for the haste with which those magnets were removed (the original Mk1 Super Puma didn't have them) has never been explained well enough for my liking.