My family used my car for a road trip and when they came back I noticed that my passenger side seat adjuster was broken and then this rolled out from underneath it the seat, I have no idea what it is tho.
Looks like part #32.
Tester
That is the flexible driveshaft that goes between the seat motor and the seat adjuster. You may be able to reach under the seat and reinstall it.
I sometimes find water bottles or shoes stuffed under the front passenger seat causing a fault in the occupant detection system, in your case they only broke the power seat adjuster.