diff --git a/geomagio/residual/SpreadsheetAbsolutesFactory.py b/geomagio/residual/SpreadsheetAbsolutesFactory.py
index 3facd71000769ba0676a097cc14afe3f0351c135..27c5be9ef4e27c32300af13eac015a9865133ea0 100644
--- a/geomagio/residual/SpreadsheetAbsolutesFactory.py
+++ b/geomagio/residual/SpreadsheetAbsolutesFactory.py
@@ -240,7 +240,7 @@ def get_summary_flags(
     endtime: UTCDateTime,
     absolute_time: UTCDateTime,
 ) -> List[Reading]:
-    """Get valid flags from SpreadsheetSummaryFactory.
+    """Get valid flags from SpreadsheetSummaryFactory and define "reviewed" metadata.
 
     Parameters
     ----------
@@ -257,18 +257,23 @@ def get_summary_flags(
 
     Returns
     -------
-    Array of valid flags for absolutes from summary sheets
+    Array of valid flags for absolutes from summary sheets and metadata
     """
     readings = factory.get_readings(
         observatory=observatory,
         starttime=UTCDateTime(starttime),
         endtime=UTCDateTime(endtime),
     )
-
-    for reading in readings:
-        if reading.time == absolute_time:
-            summary_flags = [v.valid for v in reading.absolutes]
-    return summary_flags
+    try:
+        for reading in readings:
+            if reading.time == absolute_time:
+                summary_flags = [v.valid for v in reading.absolutes]
+                reviewed = True
+        return summary_flags, reviewed
+    except:
+        print("No matching summary sheet found for time:", absolute_time)
+        reviewed = False
+        return [False, False, False], reviewed
 
 
 class SpreadsheetAbsolutesFactory(object):
@@ -329,9 +334,10 @@ class SpreadsheetAbsolutesFactory(object):
         metadata = self._parse_metadata(
             constants_sheet, measurement_sheet, calculation_sheet, summary_sheet
         )
-        absolutes = self._parse_absolutes(
+        absolutes, reviewed = self._parse_absolutes(
             summary_sheet, observatory, starttime, endtime, metadata["date"]
         )
+        metadata["reviewed:"] = reviewed
         measurements = (
             include_measurements
             and self._parse_measurements(
@@ -367,8 +373,9 @@ class SpreadsheetAbsolutesFactory(object):
         absolute_time = parse_relative_time(
             base_date, "{:04d}".format(sheet["B12"].value)
         )
-        # pull valid flags from summary spreadsheets and match with absolute_time
-        summary_flags = get_summary_flags(
+        # pull valid flags from summary spreadsheets and match with absolute_time...
+        #  and define metadata "reviewed" based on valid flags
+        summary_flags, reviewed = get_summary_flags(
             factory=SpreadsheetSummaryFactory(self.base_directory),
             observatory=observatory,
             starttime=UTCDateTime(starttime),
@@ -427,7 +434,7 @@ class SpreadsheetAbsolutesFactory(object):
                 valid=summary_flags[2],
             ),
         ]
-        return absolutes
+        return absolutes, reviewed
 
     def _parse_measurements(
         self, sheet: openpyxl.worksheet, base_date: str, precision: str