Gear teeth

Over the weekend I was changing all my Landys fluids. Everything went pretty smooth until the gearbox. I now understand why it wasn't leaking.,.basically no gear oil. I really don't drive it often. In fact it's spent most of the summer on wooden stands to access the chassis for inspection. Anyway, after draining the gear box I found 3 little surprises, broke gear teeth of some sort. See pic.
How concern should I be? Would anyone be able to recognize where they came from? I have a mini camera to inspect inside walls, would it be worth my time to drain it over again to view inside( even if I don't know what I'm looking for)


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Oh, not nice to find. They look like straight cut teeth so from the reverse idler gear and or its associated gears on lay and main shaft.
Not hard to take the top off the box for a proper look.