--- a/addons/core/Scripts/Game/ERR/40_Chat/ERR_NativeSmoke.c
+++ b/addons/core/Scripts/Game/ERR/40_Chat/ERR_NativeSmoke.c
@@ -2,6 +2,33 @@
 #ifdef WORKBENCH
 modded class ERR_GameMode
 {
+	// Read-only normal-route stock witness; no courier, movement or arming action.
+	protected bool ERR_DepotMineStockReady()
+	{
+		if (!Sites() || Sites().Count() > 64) return false;
+		int camps;
+		array<IEntity> seen = {};
+		for (int index = 0; index < Sites().Count(); index++)
+		{
+			ERR_SiteRuntime site = Sites().At(index);
+			if (!site || !site.Definition || site.Definition.Kind != ERR_LocationKind.OUTPOST || site.Definition.RevealOnEscape) continue;
+			if (!site.Container || site.DepotMines.Count() != 2) return false;
+			InventoryStorageManagerComponent inventory = InventoryStorageManagerComponent.Cast(site.Container.FindComponent(InventoryStorageManagerComponent));
+			if (!inventory || inventory.GetOwner() != site.Container) return false;
+			array<IEntity> items = {}; ERR_Inventory.Items(inventory, items);
+			if (items.Count() > 128) return false;
+			foreach (IEntity mine : site.DepotMines)
+			{
+				if (!Sites().DepotOriginal(site, mine) || !ERR_InfantryMineTransfer.ReadyMine(mine) || !items.Contains(mine)
+				 || !ERR_InfantryAmmoTransfer.StoredUnder(mine, site.Container) || seen.Contains(mine)) return false;
+				seen.Insert(mine);
+			}
+			camps++;
+		}
+		PrintFormat("ERR DEPOT MINE STOCK: original camps=%1 inert stored identities=%2; no physical courier claim", camps, seen.Count());
+		return camps > 0 && seen.Count() == camps * 2;
+	}
+
 	protected bool m_ERRTestPatrolHQ;
 	protected ref ERR_NativePatrolProbe m_ERRHQPatrolMovement;
 	protected ref ERR_NativePatrolHQProbe m_ERRHQPatrolOrder;
@@ -837,6 +864,7 @@
 			string routeOutcome; System.GetCLIParam("errSmokeOutcome", routeOutcome);
 			if (routeOutcome == "normal-escape-route")
 			{
+				if (!ERR_Check(ERR_DepotMineStockReady(), "normal camps retain two original inert PMN4 mines in each cache")) return;
 				ERR_SiteRuntime clueSite = Sites().Find("everon-supply-1");
 				ERR_NativeTransportProbe maintenanceProbe = new ERR_NativeTransportProbe(this, m_ERRSmokePlayer);
 				if (!ERR_Check(maintenanceProbe.MaintenanceStock(clueSite), "normal Southern cache holds finite maintenance stock")) return;