diff --git a/tools/smokes/v2/profiles/quick/core/map/map_delete_missing_key_vm.sh b/tools/smokes/v2/profiles/quick/core/map/map_delete_missing_key_vm.sh
new file mode 100644
index 00000000..6c43a90e
--- /dev/null
+++ b/tools/smokes/v2/profiles/quick/core/map/map_delete_missing_key_vm.sh
@@ -0,0 +1,26 @@
+#!/bin/bash
+# map_delete_missing_key_vm.sh — MapBox.delete on missing key returns stable message
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+if ROOT_GIT=$(git -C "$SCRIPT_DIR" rev-parse --show-toplevel 2>/dev/null); then
+  ROOT="$ROOT_GIT"
+else
+  ROOT="$(cd "$SCRIPT_DIR/../../../../../../../../.." && pwd)"
+fi
+source "$ROOT/tools/smokes/v2/lib/test_runner.sh"
+require_env || exit 2
+
+code='static box Main { main() { local m=new MapBox(); print(m.delete("absent")); return 0 } }'
+output=$(run_nyash_vm -c "$code")
+if echo "$output" | grep -q "Key not found: absent"; then
+  echo "[PASS] map_delete_missing_key_vm"
+  exit 0
+else
+  echo "[FAIL] map_delete_missing_key_vm" >&2
+  echo "--- output ---" >&2
+  echo "$output" >&2
+  exit 1
+fi
+
diff --git a/tools/smokes/v2/profiles/quick/core/string/last_index_not_found_vm.sh b/tools/smokes/v2/profiles/quick/core/string/last_index_not_found_vm.sh
new file mode 100644
index 00000000..794d802f
--- /dev/null
+++ b/tools/smokes/v2/profiles/quick/core/string/last_index_not_found_vm.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+# last_index_not_found_vm.sh — String.lastIndexOf not found returns -1
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+if ROOT_GIT=$(git -C "$SCRIPT_DIR" rev-parse --show-toplevel 2>/dev/null); then
+  ROOT="$ROOT_GIT"
+else
+  ROOT="$(cd "$SCRIPT_DIR/../../../../../../../../.." && pwd)"
+fi
+source "$ROOT/tools/smokes/v2/lib/test_runner.sh"
+require_env || exit 2
+
+code='static box Main { main() { local s="abcdef"; print(s.lastIndexOf("@")); return 0 } }'
+out=$(run_nyash_vm -c "$code")
+if [ "$out" = "-1" ]; then
+  echo "[PASS] last_index_not_found_vm"
+  exit 0
+else
+  echo "[FAIL] last_index_not_found_vm (got '$out')" >&2
+  exit 1
+fi
+