Migration Warning when migrating from MacBookPro to Mac mini

When Migration Assistant finished migrating from 2017 MacBook Pro to 2025 Mac mini, I got this:

“Migration Summary

Migration Warnings

  Some documents for __(me)___ could not be transferred.

    *  /Library/Keychains/XXXXXXXX-XXXX-XXXX-XXXXXXXXXXXX/keychain-2.db-shm

Files that were relocated were added to the “Relocated Items” on your Desktop”

XXXXXXXX-XXXX-XXXX-XXXXXXXXXXXX is a bunch of characters that I redacted because I don't know if this is private.

The above folder was copied to the new Mac as the following (it added four characters depicted as YYYY):

/Library/Keychains/XXXXXXXX-XXXX-YYYY-XXXX-XXXXXXXXXXXX

All the files in this folder were copied from the old Mac to the new Mac.  The only difference are the file sizes for 2 files:

• keychain-2.db-shm   131 KB vs 33 KB
• keychain-2.db-wal    255 KB vs 3.5 MB

Do I have an issue that I need to worry about?

Also, the migration process created a folder named “Relocated Items.nosync” which points to '/Users/Shared/Relocated Items’.  I don’t know what these are for. Do I need this?