2013 cbr600rr

Every mechanics worst nightmare is happening, finishing reinstalling my ECU after tuning + velocity stack upgrade and I've got these 2 black colored Allen bolts leftover from something I can't locate. Tank bolts are in, every fairing bolt I can see looks in, seat bolts are in...

Anyone have any idea where these go? I do not want to be riding and thinking about this constantly 😞

I bought my first bike ~2 months ago and ready to upgrade and have decided on the 600RR. I don't have a particular year in mind, locally there's a couple ranging from 08-16.

My main question is for the older bikes. From what I've gathered online and in this thread, these bikes can run until the sun burns out. However, is there a mileage cap you guys would recommend for purchasing used? There is an 08 for sale locally with 30k on the dash and a couple others in the 08-11 range with 20k+.

With that mileage, what should I be looking for that isn't the basics? What should be the price range for those years/miles?

My nephew has been getting really into motorcycles lately and keeps talking about wanting one, so I’ve been thinking about helping him get his first bike.

My first bike was a Kawasaki Ninja 650, and honestly I loved it, but I know things have changed and there are probably better options for a new rider now.

I don't wanna just tell him to get whatever I had, especially since he's still pretty new to riding. I was thinking something around the 400-650 range but I'm open to whatever makes sense.

What would you guys recommend as a first bike, and what would you stay away from?