New bike – left over parts!

Just bought a new 2024 Marlin 6 for my son for Xmas and had it delivered and the handlebars and front wheel needed fitting. Finished that quite easily but there are two bits left over that I don’t know what to do with!

One I have identified via google images as a Trek 2023 switch lever tool. Still not sure what it does though and whether I need it.

The other is a small strip of plastic about 1cm wide and 7cm long. Has a couple of indented circles along it (photos attached. ) any help appreciated. Thanks.