Checks contents of storage items for restrictions (#17236)

Co-authored-by: warriorstar-orion <59303604+warriorstar-orion@users.noreply.github.com>

code/game/objects/items/weapons/storage/storage.dm

@@ -43,7 +43,7 @@
 	var/foldable_amt = 0
 
 	/// Lazy list of mobs which are currently viewing the storage inventory.
-	var/list/mobs_viewing 
+	var/list/mobs_viewing
 
 /obj/item/storage/Initialize(mapload)
 	. = ..()
@@ -353,6 +353,14 @@
 			to_chat(usr, "<span class='warning'>[src] cannot hold [I].</span>")
 		return FALSE
 
+	if(length(cant_hold) && istype(I, /obj/item/storage)) //Checks nested storage contents for restricted objects, we don't want people sneaking the NAD in via boxes now, do we?
+		var/obj/item/storage/S = I
+		for(var/obj/A in S.return_inv())
+			if(is_type_in_typecache(A, cant_hold))
+				if(!stop_messages)
+					to_chat(usr, "<span class='warning'>[src] rejects [I] because of its contents.</span>")
+				return FALSE
+
 	if(I.w_class > max_w_class)
 		if(!stop_messages)
 			to_chat(usr, "<span class='warning'>[I] is too big for [src].</span>")