Windows 10 lost ~60 GB after two System Restore operations, but shadow storage shows minimal usage – where did the space go?

After performing two System Restore operations on Windows 10 Pro 22H2, my system drive (C:) lost more than 60 GB of free space (about 30 GB per restore).

However, I cannot determine what is occupying this space.

System:

• Windows 10 Pro 22H2
• 32 GB RAM
• C: drive ~292 GB (NTFS)

What I have checked:

1. vssadmin list shadows
   → Only 1 shadow copy listed

2. vssadmin list shadowstorage
   → Used shadow storage ~121 MB
   → Maximum shadow storage ~2.92 GB

3. DISM cleanup:
   DISM /Online /Cleanup-Image /StartComponentCleanup
   → Completed successfully

4. fsutil fsinfo ntfsinfo C:
   → MFT size: 128 KB

Disk analysis tools (Sniffer and TreeSize-like scanners) do not show any obvious large folders accounting for this 60+ GB difference.

The space is categorized by Windows Storage as “System & Reserved”.

Questions:

• Can System Restore create hidden data not reflected in current VSS shadow storage?
• Could restore operations leave behind hidden system files or differential data?
• Is there a way to precisely locate what consumed ~60 GB after restore?
• Can this space be safely reclaimed?

I am comfortable using PowerShell and low-level disk tools if necessary.