diff --git a/src/client.ts b/src/client.ts
index fd48487..bed7071 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -1438,7 +1438,7 @@ interface NamedFormatter {
   format: (result: Record<string, unknown>) => boolean;
 }
 
-const resultFormatters: NamedFormatter[] = [
+export const resultFormatters: NamedFormatter[] = [
   // Player status
   {
     name: 'player_status',
@@ -1684,10 +1684,16 @@ const resultFormatters: NamedFormatter[] = [
         console.log(`(No wrecks at this location)`);
       } else {
         for (const w of wrecks) {
-          console.log(`\n${c.yellow}Wreck: ${w.wreck_id}${c.reset}`);
+          console.log(`\n${c.yellow}Wreck: ${w.id}${c.reset}`);
           console.log(`  Ship: ${w.ship_class}`);
-          console.log(`  Expires in: ${w.ticks_remaining} ticks`);
-          const items = (w.items as Array<Record<string, unknown>>) || [];
+          // expire_tick === 0 means the wreck never expires (ship/pirate/abandoned wrecks);
+          // only jettisoned junk containers get a finite expiry.
+          if (w.expire_tick) {
+            console.log(`  Expires at: ${w.expires_at ?? `tick ${w.expire_tick}`}`);
+          } else {
+            console.log(`  Expires: never`);
+          }
+          const items = (w.cargo as Array<Record<string, unknown>>) || [];
           if (items.length) {
             console.log(`  Contents:`);
             for (const item of items) console.log(`    - ${item.quantity}x ${item.item_id}`);
@@ -2644,4 +2650,7 @@ async function main(): Promise<void> {
   }
 }
 
-main();
+// Only run the CLI when executed directly, so the module can be imported by tests.
+if (import.meta.main) {
+  main();
+}
diff --git a/src/wrecks-format.test.ts b/src/wrecks-format.test.ts
new file mode 100644
index 0000000..634d9fc
--- /dev/null
+++ b/src/wrecks-format.test.ts
@@ -0,0 +1,68 @@
+/**
+ * Regression test for gh#1874 — get_wrecks output printed "undefined" for the
+ * wreck id and expiry because the formatter read fields the server never emits
+ * (`wreck_id`, `ticks_remaining`, `items`). The server emits `id`, `expire_tick`
+ * / `expires_at`, and `cargo`.
+ */
+
+import { describe, expect, test } from 'bun:test';
+import { resultFormatters } from './client';
+
+const wrecksFormatter = resultFormatters.find((f) => f.name === 'wrecks');
+if (!wrecksFormatter) throw new Error('wrecks formatter not found');
+
+function render(result: Record<string, unknown>): string {
+  const lines: string[] = [];
+  const orig = console.log;
+  console.log = (...args: unknown[]) => lines.push(args.join(' '));
+  try {
+    wrecksFormatter.format(result);
+  } finally {
+    console.log = orig;
+  }
+  // Colour codes wrap whole tokens, so the asserted substrings stay contiguous.
+  return lines.join('\n');
+}
+
+describe('get_wrecks formatter (gh#1874)', () => {
+  test('renders the real server fields, never the literal "undefined"', () => {
+    const out = render({
+      wrecks: [
+        {
+          id: 'wreck_abc123',
+          ship_class: 'eviction_notice',
+          expire_tick: 0, // ship/pirate/abandoned wrecks never expire
+          cargo: [{ item_id: 'titanium_ore', quantity: 12 }],
+        },
+      ],
+    });
+
+    expect(out).not.toContain('undefined');
+    expect(out).toContain('Wreck: wreck_abc123');
+    expect(out).toContain('Ship: eviction_notice');
+    expect(out).toContain('Expires: never');
+    expect(out).toContain('12x titanium_ore');
+  });
+
+  test('shows a finite expiry for jettisoned containers that do expire', () => {
+    const out = render({
+      wrecks: [
+        {
+          id: 'wreck_junk',
+          ship_class: 'jettison',
+          expire_tick: 1500,
+          expires_at: '2026-07-23T00:00:00Z',
+          cargo: [],
+        },
+      ],
+    });
+
+    expect(out).not.toContain('undefined');
+    expect(out).toContain('Expires at: 2026-07-23T00:00:00Z');
+  });
+
+  test('handles the empty-wrecks case', () => {
+    const out = render({ wrecks: [] });
+    expect(out).toContain('No wrecks at this location');
+  });
+});