This is not the first time I've heard of some dim bulb leaving things loose and dangerous for the customer to (hopefully) deal with.
Almost all shops have one guy who knows what's going on, but many times, so-called "simple" tasks are left to the cheap helpers. Another reason I've done most of my own work for the past 50 years. No sense paying someone who's not even as smart as I am to do things that could affect my health.
It may be a pig, but it's a pig with a rocket in it's ass!