This is for Nethack 3.4.0, which is an outdated version.
Since 3.4.2, the functionality is already included in the official source
without any patches. I strongly recommend using the newest version of
the source instead of still patching the old 3.4.0.
See http://www.nethack.org

--- src/end.c.nostatcont	Thu Jan 30 22:57:54 2003
+++ src/end.c	Tue Feb 18 18:46:34 2003
@@ -1117,7 +1117,9 @@
 	int classcount;
 
 	for (box = list; box; box = box->nobj) {
+#ifndef STATCONT
 	    if (Is_container(box) && box->otyp != BAG_OF_TRICKS) {
+#endif
 		if (box->cobj) {
 		    winid tmpwin = create_nhwindow(NHW_MENU);
 		    Sprintf(buf, "Contents of %s:", the(xname(box)));
@@ -1169,7 +1171,11 @@
 			container_contents(box->cobj, identified, TRUE);
 #endif
 		    }
-		} else {
+		} else
+#ifdef STATCONT
+		if (Is_container(box))
+#endif
+		{
 		    pline("%s empty.", Tobjnam(box, "are"));
 		    display_nhwindow(WIN_MESSAGE, FALSE);
 #ifdef DUMP_LOG
@@ -1177,7 +1183,9 @@
 		      dump(The(xname(box)), " is empty.");
 #endif
 		}
-	    }
+#ifndef STATCONT
+	    }   /* Is_container */
+#endif
 	    if (!all_containers)
 		break;
 	}