All the files are under /mnt/disk1, /mnt/disk2, ... , /mnt/cache, and also under /mnt/user because
If the files still exist, then they are in the user shares somewhere, maybe you moved them
This seems extremely unlikely
According to your diagnostics, there were other shares using cache, including cache-prefer shares. Cache-prefer shares would normally have all files on cache.
You also have an unassigned disk not mounted and apparently set to passthru. Did you only have disk1,2,3,4 and cache,cache2 before the New Config? If you only dropped cache why were you rebuilding parity?