diff --git a/src/lambda_function/raw_sync/app.py b/src/lambda_function/raw_sync/app.py
index 4e46101..aa01232 100644
--- a/src/lambda_function/raw_sync/app.py
+++ b/src/lambda_function/raw_sync/app.py
@@ -54,7 +54,7 @@ def lambda_handler(event: dict, context: dict) -> None:
     )
 
 
-def append_s3_key(key: str, key_format: str, result: dict) -> None:
+def append_s3_key(key: str, key_format: str, result: defaultdict) -> defaultdict:
     """
     Organizes an S3 object key by appending it to the appropriate entry in the result dictionary
 
@@ -68,7 +68,7 @@ def append_s3_key(key: str, key_format: str, result: dict) -> None:
                        it is structured as result[cohort].
 
     Returns:
-        None
+        defaultdict: The `result` dict with `key` added.
     """
     result = result.copy()  # shallow copy safe for append
     if not key.endswith("/"):  # Ignore keys that represent "folders"
@@ -97,7 +97,7 @@ def append_s3_key(key: str, key_format: str, result: dict) -> None:
 
 def list_s3_objects(
     s3_client: boto3.client, bucket: str, key_prefix: str, key_format: str
-) -> dict:
+) -> defaultdict:
     """
     Recursively list all objects under an S3 bucket and key prefix which
     conform to a specified format.
@@ -159,6 +159,8 @@ def list_s3_objects(
         result = defaultdict(lambda: defaultdict(list))
     elif key_format == "input":
         result = defaultdict(list)
+    else:
+        raise ValueError("Argument `key_format` must be either 'input' or 'raw'.")
     for response in response_iterator:
         for obj in response.get("Contents", []):
             key = obj["Key"]
@@ -232,7 +234,7 @@ def parse_content_range(content_range: str) -> tuple[int, ...]:
     return range_start, range_end, total_size
 
 
-def unpack_eocd_fields(body: bytes, eocd_offset: int) -> list[int]:
+def unpack_eocd_fields(body: bytes, eocd_offset: int) -> tuple[int, int]:
     """
     Extract the End of Central Directory (EOCD) fields from the given body.
 
@@ -305,7 +307,7 @@ def determine_eocd_offset(body: bytes, content_range: str) -> int:
 
 def list_files_in_archive(
     s3_client: boto3.client, bucket: str, key: str, range_size=64 * 1024
-) -> list[str]:
+) -> list[dict]:
     """
     Recursively lists files in a ZIP archive stored as an S3 object.
 
@@ -464,6 +466,23 @@ def publish_to_sns(
     sns_client.publish(TopicArn=sns_arn, Message=json.dumps(file_info))
 
 
+def get_data_type_from_path(path: str) -> str:
+    """
+    Give the path of an export file, return its associated data type
+
+    Args:
+        path (str): The path of an export file
+
+    Returns:
+        data_type (str): The data type
+    """
+    basename = os.path.basename(path)
+    data_type = basename.split("_")[0]
+    if "Deleted" in basename:
+        data_type = f"{data_type}_Deleted"
+    return data_type
+
+
 def main(
     event: dict,
     s3_client: boto3.client,
@@ -499,7 +518,7 @@ def main(
                 f"Checking corresponding raw object for {filename} "
                 f"from s3://{input_bucket}/{export_key}"
             )
-            data_type = filename.split("_")[0]
+            data_type = get_data_type_from_path(path=filename)
             file_identifier = filename.split(".")[0]
             expected_key = (
                 f"{namespace}/json/dataset={data_type}"
diff --git a/tests/test_lambda_raw_sync.py b/tests/test_lambda_raw_sync.py
index 227db50..58daa7d 100644
--- a/tests/test_lambda_raw_sync.py
+++ b/tests/test_lambda_raw_sync.py
@@ -612,3 +612,24 @@ def test_publish_to_sns_with_sqs_subscription():
     sqs_client.delete_message(
         QueueUrl=sqs_url, ReceiptHandle=messages["Messages"][0]["ReceiptHandle"]
     )
+
+
+def test_get_data_type_from_path_simple():
+    """Test a path with no subtype or 'Deleted' component"""
+    path = "path/to/FitbitIntradayCombined_20241111-20241112.json"
+    data_type = app.get_data_type_from_path(path=path)
+    assert data_type == "FitbitIntradayCombined"
+
+
+def test_get_data_type_from_path_subtype():
+    """Test a path with a subtype"""
+    path = "path/to/HealthKitV2Samples_AppleStandTime_20241111-20241112.json"
+    data_type = app.get_data_type_from_path(path=path)
+    assert data_type == "HealthKitV2Samples"
+
+
+def test_get_data_type_from_path_deleted():
+    """Test a path with a subtype and a 'Deleted' component"""
+    path = "path/to/HealthKitV2Samples_AppleStandTime_Deleted_20241111-20241112.json"
+    data_type = app.get_data_type_from_path(path=path)
+    assert data_type == "HealthKitV2Samples_Deleted"