I agree with onehundred80, with 5 quarts of oil in it already, I would not worry about any damage to the engine.

A percentage of bad technicians/mechanics can be found in dealerships or independents. It could have been worse, in 1992 a quick lube place failed to refill the oil in one of my cars. Since then I have always changed my own oil and filter. It takes less time, and you know what quality products you are putting in your car.

In 1998 I observed a technician at a car service chain starting to put the wrong transmission fluid into one of my cars. They were supposed to do a flush and fill with a machine. I came in after they had it all day to see what was going on. Fortunately, I was able to stop him in time. I'm now also doing the trans fluid and filter changes on my other cars as well.