The [4951-33-265-00000225] warning, references a parent document that has been deleted. This means that the document is an orphan. Orphan documents can be migrated.
You could use the following setting to migrate Orphan Documents if desired:
[Notes] MigrateOrphanedDocs=<#>
Type: Default:1
Tells the Data Migration Wizard whether to migrate "orphaned" documents that appear only in the Notes All Documents folder. Orphaned documents are migrated by default, to an All Documents folder in Exchange, but this feature can be disabled (orphaned documents will not be migrated) by setting this parameter to zero:
MigrateOrphanedDocs=0
Note: If using configuration templates, please refer to the following KB article for help with editing the Default Configuration:
https://support.quest.com/migrator-for-notes-to-exchange/kb/134859
