diff --git a/team-CHIMPLE/tablet-tracker/extract_serial_numbers_not_found_in_tablet_tracker.py b/team-CHIMPLE/tablet-tracker/extract_serial_numbers_not_found_in_tablet_tracker.py
new file mode 100644
index 00000000..75c53e0c
--- /dev/null
+++ b/team-CHIMPLE/tablet-tracker/extract_serial_numbers_not_found_in_tablet_tracker.py
@@ -0,0 +1,90 @@
+# Extracts serial numbers found in tablet usage data, but not in tablet tracker.
+#
+# Usage:
+#     cd tablet-tracker
+#     python3 extract_serial_numbers_not_found_in_tablet_tracker.py
+#
+# The resulting list of missing serial numbers will be stored in a file named `serial-numbers-not-found-in-tablet-tracker.csv`.
+
+import csv
+import logging
+
+logging.basicConfig(format='%(levelname)s | %(asctime)s | %(message)s', level=logging.DEBUG)
+
+
+# Extract serial numbers from tablet tracker, and add them to an array
+serial_numbers_in_tablet_tracker = []
+with open('tablet-tracker-CHIMPLE.csv') as in_file:
+    csv_data = csv.reader(in_file)
+    row_count = 0
+    for csv_row in csv_data:
+        row_count += 1
+        if row_count == 1:
+            # Skip header row
+            continue
+
+        logging.debug("csv_row: {}".format(csv_row))
+
+        # Iterate serial columns ("Serial #1" --> "Serial #14")
+        removal_count = 1
+        column_index = 2
+        while removal_count <= 14:
+            serial_number = csv_row[column_index]
+            logging.debug("Serial #{0}: {1}".format(removal_count, serial_number))
+
+            if (serial_number != "") and (serial_number not in serial_numbers_in_tablet_tracker):
+                serial_numbers_in_tablet_tracker.append(serial_number)
+
+            removal_count += 1
+            if removal_count == 2:
+                column_index += 1
+            else:
+                column_index += 2
+logging.debug("serial_numbers_in_tablet_tracker: {}".format(serial_numbers_in_tablet_tracker))
+logging.debug("len(serial_numbers_in_tablet_tracker): {}".format(len(serial_numbers_in_tablet_tracker)))
+
+
+# Iterate the serial numbers in `tablets-uploading-data-CHIMPLE.csv`
+with open('../tablets-uploading-data/tablets-uploading-data-CHIMPLE.csv') as in_file:
+    serial_numbers_not_found_in_tablet_tracker = []
+
+    csv_data = csv.reader(in_file)
+    row_count = 0
+    for csv_row in csv_data:
+        row_count += 1
+        if row_count == 1:
+            # Skip header row
+            continue
+
+        logging.debug("csv_row: {}".format(csv_row))
+
+        tablet_serials = csv_row[4]
+        logging.debug("tablet_serials: {}".format(tablet_serials))
+
+        # Convert string to array. E.g. "['5B12002947', '6111002083', '6116000839', '6116001775', '6116002363', '6130000141']"
+        tablets_serials_as_array = eval(tablet_serials)
+        logging.debug("tablets_serials_as_array: {}".format(tablets_serials_as_array))
+        logging.debug("len(tablets_serials_as_array): {}".format(len(tablets_serials_as_array)))
+
+        # Iterate each serial number and check if it can be found in the tablet tracker
+        for tablet_serial in tablets_serials_as_array:
+            logging.debug("tablet_serial: {}".format(tablet_serial))
+
+            if tablet_serial not in serial_numbers_in_tablet_tracker:
+                logging.warning("tablet_serial not found in tablet tracker: {}".format(tablet_serial))
+                if tablet_serial not in serial_numbers_not_found_in_tablet_tracker:
+                    serial_numbers_not_found_in_tablet_tracker.append(tablet_serial)
+
+    logging.debug("serial_numbers_not_found_in_tablet_tracker: {}".format(serial_numbers_not_found_in_tablet_tracker))
+    logging.debug("len(serial_numbers_not_found_in_tablet_tracker): {}".format(len(serial_numbers_not_found_in_tablet_tracker)))
+
+    # Write results to a CSV file
+    csv_filename = "serial-numbers-not-found-in-tablet-tracker.csv"
+    print("Writing list of missing tablet serials to the file \"" + csv_filename + "\"")
+    with open(csv_filename, mode='w') as csv_file:
+        csv_fieldnames = ['serial_number']
+        csv_writer = csv.writer(csv_file, csv_fieldnames)
+        csv_writer.writerow(csv_fieldnames)
+        for serial_number in serial_numbers_not_found_in_tablet_tracker:
+            serial_number_as_list = [serial_number]
+            csv_writer.writerow(serial_number_as_list)
diff --git a/team-CHIMPLE/tablet-tracker/serial-numbers-not-found-in-tablet-tracker.csv b/team-CHIMPLE/tablet-tracker/serial-numbers-not-found-in-tablet-tracker.csv
new file mode 100644
index 00000000..750779ee
--- /dev/null
+++ b/team-CHIMPLE/tablet-tracker/serial-numbers-not-found-in-tablet-tracker.csv
@@ -0,0 +1,82 @@
+serial_number
+6116001019
+6116001847
+6116002599
+5A27001337
+6130000243
+5A29001450
+6113000008
+6115001201
+5A28002591
+5A27001419
+5B13001505
+5A27001395
+5A28000347
+6116002187
+6118001508
+5A27001796
+6116000842
+6116001375
+5A27001765
+6113000238
+5A28000969
+5A28002064
+5B13001085
+5A27000657
+6118002643
+6126000507
+5B13001232
+5A28000332
+6111001893
+6113000738
+6115002391
+5B20002011
+5A27000801
+6116002671
+6118002959
+5B20002263
+6118003009
+5A27000478
+6118003199
+5A28000685
+6111001783
+6115000561
+5B20001369
+6116001278
+6116001657
+6118003298
+6118002996
+5A27000554
+5A28000182
+5A27001530
+5A27002080
+5A28001170
+6129001664
+5B20002005
+6116002596
+5B20001217
+6109000540
+6111001716
+6115000386
+5A27001825
+6116001126
+5A27001483
+6111001762
+6118002946
+6111001096
+6113001068
+6116000778
+6116000805
+6118002285
+6116002652
+6116002079
+5A29000767
+5B12003436
+6112001529
+6116002824
+5A27002171
+5A28001033
+6116002209
+6118002898
+5A27000459
+5A27001891