That's quite a haul, Ian!
In recent days, I've found a few items myself. Unlike yours, which seem to run heavily toward mudguard-related items, mine are all brake-related. Pads, pad-retaining nuts and washers, even whole calipers(!).
I wondered why the riders didn't notice and stop, then realized they may have noticed but *couldn't* stop!
A good reminder to all to check those fittings; thanks!
All the best,
Dan.