diff --git a/test/aprsme/packets_test.exs b/test/aprsme/packets_test.exs
index f8c454b..e33e654 100644
--- a/test/aprsme/packets_test.exs
+++ b/test/aprsme/packets_test.exs
@@ -166,6 +166,77 @@ defmodule Aprsme.PacketsTest do
     end
   end
 
+  describe "store_packet/1 with additional edge cases" do
+    test "stores a packet with string-keyed data_extended" do
+      packet_data = %{
+        sender: "STRKEY1",
+        base_callsign: "STRKEY1",
+        ssid: "0",
+        destination: "APRS",
+        raw_packet: "STRKEY1>APRS",
+        data_type: "position",
+        data_extended: %{
+          "latitude" => 33.0,
+          "longitude" => -96.0,
+          "symbol_table_id" => "/",
+          "symbol_code" => ">"
+        }
+      }
+
+      assert {:ok, packet} = Packets.store_packet(packet_data)
+      assert packet.sender == "STRKEY1"
+    end
+
+    test "stores a packet with nested position map inside data_extended" do
+      packet_data = %{
+        sender: "NESTPOS1",
+        base_callsign: "NESTPOS1",
+        ssid: "0",
+        destination: "APRS",
+        raw_packet: "NESTPOS1>APRS",
+        data_type: "position",
+        data_extended: %{
+          position: %{latitude: 33.0, longitude: -96.0}
+        }
+      }
+
+      assert {:ok, packet} = Packets.store_packet(packet_data)
+      assert packet.sender == "NESTPOS1"
+    end
+
+    test "device_identifier is set from destination fallback when DeviceParser returns nil" do
+      packet_data = %{
+        sender: "DEVFALL1",
+        base_callsign: "DEVFALL1",
+        ssid: "0",
+        destination: "APUNKNOWN",
+        raw_packet: "DEVFALL1>APUNKNOWN:=3950.00N/09830.00W>",
+        data_type: "position",
+        lat: 39.83,
+        lon: -98.5
+      }
+
+      assert {:ok, packet} = Packets.store_packet(packet_data)
+      assert is_binary(packet.device_identifier)
+    end
+
+    test "handles a binary lat/lon that can be parsed" do
+      packet_data = %{
+        sender: "BINCOORD1",
+        base_callsign: "BINCOORD1",
+        ssid: "0",
+        destination: "APRS",
+        raw_packet: "BINCOORD1>APRS",
+        data_type: "position",
+        lat: "39.833",
+        lon: "-98.5"
+      }
+
+      assert {:ok, packet} = Packets.store_packet(packet_data)
+      assert packet.sender == "BINCOORD1"
+    end
+  end
+
   describe "store_bad_packet/2" do
     test "stores bad packet from string" do
       error = %{message: "Parse error", type: "ParseError"}