After missing files of a Premiere Pro Project Sequence

1 About a Premiere Pro 2023 Video (Wedding) Project from 3 video cameras.

After missing files of a Premiere Pro Project Sequence, tried Locate them, mostly found, but some clips still missing… What mean the black-white lines (seem) clips? How locate these?

2 The: Media Start, Tape Name, Clip ID In Link Media Window are for what purpose?