Blacklist providers working or not?

I am using Exchange 2013.  I can run: get-ipblocklistprovider and see my 7 blacklist providers:

Name                                    LookupDomain                            Priority
----                                    ------------                            --------
SpamCop                                 bl.spamcop.net                          1
SpamHaus                                zen.spamhaus.org                        2
Sorbs RHSBL                             rhsbl.sorbs.net                         3
Sorbs DNSBL                             dnsbl.sorbs.net                         4
apews                                   l2.apews.org                            5
Abuseat                                 cbl.abuseat.org                         6
Barracuda central                       b.barracudacentral.org                  7

But I cannot see that they work, are in use or create any logs.

I tried this:

[PS] C:\Program Files\Microsoft\Exchange Server\V15\Scripts>Set-TransportService myserver -AgentLogPath "D:\Exchange\Spamlogs" -AgentLogMaxFileSize 20MB -AgentLogMaxDirectorySize 400MB -AgentLogMaxAge 14.00:00:00

I also tried this: .\get-AntispamSCLHistogram.ps1

But it errors out with: The location "D:\Exchange\Spamlogs" doesn't contain any logs for the specified time range.

No logs are created. What could be wrong?