QuotaUserName and QuotaTarget Are Empty in GetNcQuotaReport

When running Get-NcQuotaReport we get numerous entries where the QuotaUserName and QuotaTarget are empty or blank.  How do we find out which files are contributing to these?

Get-NcQuotaReport -Volume Our_Volume | Select-Object diskused,QuotaUsers,Quotatarget | Where-Object {$_.QuotaUsers.QuotaUserName -like ''}

DiskUsed  QuotaUsers QuotaTarget
--------  ---------- -----------
4         {} 
33426292  {} 
40        {} 
3026624   {} 
115472068 {} 
4         {} 
24859292  {} 
44        {} 
41184     {} 
5140      {} 
32        {} 
19480     {} 
34232     {} 
159148    {} 
4         {} 
32619876  {}