diff --git a/openbis_standard_technologies/dist/core-plugins/eln-lims-life-sciences/1/as/initialize-master-data.py b/openbis_standard_technologies/dist/core-plugins/eln-lims-life-sciences/1/as/initialize-master-data.py
index bf2f249601cf58c866ea9d2ff68c4b5d7c8217de..3b87d397bb76dca66bc40dc83fe12e0d2a5be876 100644
--- a/openbis_standard_technologies/dist/core-plugins/eln-lims-life-sciences/1/as/initialize-master-data.py
+++ b/openbis_standard_technologies/dist/core-plugins/eln-lims-life-sciences/1/as/initialize-master-data.py
@@ -41,8 +41,12 @@ def get_all_scripts():
     return scripts
 
 
+class ListForBinaries(ArrayList):
+    def toString(self):
+        return "%s blobs" % self.size()
+
 def list_xls_byte_arrays():
-    xls = ArrayList()
+    xls = ListForBinaries()
     for f in os.listdir(TYPES_FOLDER):
         if f.endswith('.xls') or f.endswith('.xlsx'):
             excel_file = open(os.path.join(TYPES_FOLDER, f))
diff --git a/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py b/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py
index bf2f249601cf58c866ea9d2ff68c4b5d7c8217de..3ce933e81346ecff7c32af98f6d76f1f1b1252c3 100644
--- a/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py
+++ b/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/initialize-master-data.py
@@ -40,9 +40,12 @@ def get_all_scripts():
 
     return scripts
 
+class ListForBinaries(ArrayList):
+    def toString(self):
+        return "%s blobs" % self.size()
 
 def list_xls_byte_arrays():
-    xls = ArrayList()
+    xls = ListForBinaries()
     for f in os.listdir(TYPES_FOLDER):
         if f.endswith('.xls') or f.endswith('.xlsx'):
             excel_file = open(os.path.join(TYPES_FOLDER, f))