I find it difficult to accept that this wasn't a planned event. How does a 17 yo have the knowledge to know a) where to find a convenient hole in the fence at short notice b) that wearing hi-vis clothing will get him unchallenged access to the aircraft and c) wearing a tool belt will enhance his cover story? It was fortunate that at a small crew base like Avalon a new face will create questions as usually the cc and engineers are well known to each other.
closes door and dead bolts
Your scenario is already flawed with that statement.