These are actually distinguished folders.

exchangelib/folders/known_folders.py

@@ -271,6 +271,11 @@ class ArchiveRecoverableItemsVersions(WellknownFolder):
     supported_from = EXCHANGE_2010_SP1
 
 
+class CalendarSearchCache(WellknownFolder):
+    DISTINGUISHED_FOLDER_ID = "calendarsearchcache"
+    CONTAINER_CLASS = "IPF.Appointment"
+
+
 class Companies(WellknownFolder):
     DISTINGUISHED_FOLDER_ID = "companycontacts"
     CONTAINER_CLASS = "IPF.Contact.Company"
@@ -385,6 +390,11 @@ class PeopleConnect(WellknownFolder):
     supported_from = EXCHANGE_2013
 
 
+class PersonMetadata(WellknownFolder):
+    DISTINGUISHED_FOLDER_ID = "personmetadata"
+    CONTAINER_CLASS = "IPF.Contact"
+
+
 class QedcDefaultRetention(WellknownFolder):
     DISTINGUISHED_FOLDER_ID = "qedcdefaultretention"
     supported_from = EXCHANGE_O365
@@ -547,10 +557,6 @@ class CalendarLogging(NonDeletableFolder):
     }
 
 
-class CalendarSearchCache(NonDeletableFolder):
-    CONTAINER_CLASS = "IPF.Appointment"
-
-
 class CommonViews(NonDeletableFolder):
     DEFAULT_ITEM_TRAVERSAL_DEPTH = ASSOCIATED
     LOCALIZED_NAMES = {
@@ -652,10 +658,6 @@ class PassThroughSearchResults(NonDeletableFolder):
     }
 
 
-class PersonMetadata(NonDeletableFolder):
-    CONTAINER_CLASS = "IPF.Contact"
-
-
 class PdpProfileV2Secured(NonDeletableFolder):
     CONTAINER_CLASS = "IPF.StoreItem.PdpProfileSecured"
 
@@ -725,7 +727,6 @@ class WorkingSet(NonDeletableFolder):
     AllTodoTasks,
     Audits,
     CalendarLogging,
-    CalendarSearchCache,
     CommonViews,
     ConversationSettings,
     DefaultFoldersChangeHistory,
@@ -743,7 +744,6 @@ class WorkingSet(NonDeletableFolder):
     OrganizationalContacts,
     ParkedMessages,
     PassThroughSearchResults,
-    PersonMetadata,
     PdpProfileV2Secured,
     Reminders,
     RSSFeeds,
@@ -767,6 +767,7 @@ class WorkingSet(NonDeletableFolder):
     AllItems,
     AllPersonMetadata,
     Calendar,
+    CalendarSearchCache,
     Companies,
     Conflicts,
     Contacts,
@@ -790,6 +791,7 @@ class WorkingSet(NonDeletableFolder):
     Outbox,
     PeopleCentricConversationBuddies,
     PeopleConnect,
+    PersonMetadata,
     QedcDefaultRetention,
     QedcLongRetention,
     QedcMediumRetention,