diff --git a/pipeline/fiftyone_pipeline_engines_fiftyone/src/fiftyone_pipeline_engines_fiftyone/share_usage.py b/pipeline/fiftyone_pipeline_engines_fiftyone/src/fiftyone_pipeline_engines_fiftyone/share_usage.py
index 943674b8..3a91a980 100644
--- a/pipeline/fiftyone_pipeline_engines_fiftyone/src/fiftyone_pipeline_engines_fiftyone/share_usage.py
+++ b/pipeline/fiftyone_pipeline_engines_fiftyone/src/fiftyone_pipeline_engines_fiftyone/share_usage.py
@@ -435,9 +435,10 @@ def found_evidence(self, flow_data):
         The evidence the element finds to share. These are the values of the
         web request, when the web integration added it as
         server.http-request, and every evidence value in the flow data,
-        whether an element accepted it or not. A key found in both places
-        takes the evidence value. The web request itself is never one of
-        them.
+        whether an element accepted it or not. Keys are compared without
+        regard to case, so a key found in more than one place is found
+        once, with the evidence value and the evidence's spelling. The web
+        request itself is never one of them.
 
         @type flow_data: FlowData
         @param flow_data: The flow data being processed
@@ -450,12 +451,15 @@ def found_evidence(self, flow_data):
         unaccepted = getattr(evidence, "get_unaccepted", dict)()
         web_request = unaccepted.get(HTTP_REQUEST_KEY) or \
             evidence.get(HTTP_REQUEST_KEY) or {}
+        # The key of each value found, by its lower case form. A later
+        # source replaces both the value and the spelling of an earlier one.
         found = {}
         for source in (web_request, unaccepted, evidence.get_all()):
             for key, value in source.items():
-                if str(key).lower() != HTTP_REQUEST_KEY:
-                    found[key] = value
-        return found
+                folded = str(key).lower()
+                if folded != HTTP_REQUEST_KEY:
+                    found[folded] = (key, value)
+        return dict(found.values())
 
     def share_send_usage(self):
         """!
diff --git a/pipeline/fiftyone_pipeline_engines_fiftyone/tests/test_share_usage_accepts_no_evidence.py b/pipeline/fiftyone_pipeline_engines_fiftyone/tests/test_share_usage_accepts_no_evidence.py
index e683f856..503abff0 100644
--- a/pipeline/fiftyone_pipeline_engines_fiftyone/tests/test_share_usage_accepts_no_evidence.py
+++ b/pipeline/fiftyone_pipeline_engines_fiftyone/tests/test_share_usage_accepts_no_evidence.py
@@ -25,8 +25,13 @@
 depend on it. It shares what it finds in the flow data and in the web
 request instead, by the same rules as before."""
 
+import gzip
+import re
 import unittest
+from types import MappingProxyType
+from unittest import mock
 
+import requests
 from flask import Flask, request
 
 from fiftyone_pipeline_core.basiclist_evidence_keyfilter import \
@@ -82,6 +87,22 @@ def request_evidence(headers, path="/"):
         return webevidence(request)
 
 
+def sent_on_close(usage):
+    """Closes the usage sharing element, which sends what it has queued,
+    and returns the text of each message it posted. The post is answered
+    with a 200 without leaving the process."""
+
+    sent = []
+
+    def post(url, headers=None, data=None, **kwargs):
+        sent.append(gzip.decompress(data).decode("utf8"))
+        return mock.Mock(status_code=200, text="")
+
+    with mock.patch.object(requests, "post", post):
+        usage.close()
+    return sent
+
+
 class ShareUsageAcceptsNoEvidenceTests(unittest.TestCase):
 
     def test_the_pipeline_accepts_no_header_for_usage_sharing(self):
@@ -171,6 +192,40 @@ def test_a_key_in_both_places_is_shared_once_with_the_evidence_value(self):
         self.assertIn(
             '<header Name="x-test">from the evidence</header>', shared)
 
+    def test_a_header_no_element_reads_is_in_the_message_sent(self):
+        usage = usage_element()
+        flowdata = pipeline_with(usage).create_flowdata()
+        flowdata.evidence.add_from_dict(request_evidence({
+            "User-Agent": CHROME,
+            "X-Test": "only usage sharing reads this",
+        }))
+        flowdata.process()
+
+        sent = sent_on_close(usage)
+        self.assertEqual(1, len(sent))
+        self.assertIn(
+            '<header Name="x-test">only usage sharing reads this</header>',
+            sent[0])
+        self.assertNotIn("http-request", sent[0])
+
+    def test_a_key_in_both_places_whose_letters_differ_is_shared_once(self):
+        usage = usage_element()
+        flowdata = pipeline_with(usage).create_flowdata()
+        # Added before the request, so the evidence keeps this spelling and
+        # the request carries the other one.
+        flowdata.evidence.add("HEADER.User-Agent", "evidence agent")
+        flowdata.evidence.add("server.http-request", MappingProxyType({
+            "header.user-agent": "request agent"}))
+        flowdata.process()
+
+        sent = sent_on_close(usage)
+        self.assertEqual(1, len(sent))
+        names = re.findall(
+            r'<header Name="[^"]*user-agent"', sent[0], re.IGNORECASE)
+        self.assertEqual(1, len(names))
+        self.assertIn("evidence agent", sent[0])
+        self.assertNotIn("request agent", sent[0])
+
     def test_evidence_added_by_hand_is_shared_as_before(self):
         usage = usage_element()
         flowdata = pipeline_with(usage).create_flowdata()