Things happen, as long as the installer is willing to correct the mistake, that's the most important part. Even professionals (in any capacity) are not infallible.

It's how they respond that matters most, sounds like a good outcome here. We got some good info too boot! All is well that ends well.

Generally, whenever I am fishing these things through I wrap them to protect them. (Now that I plan to install my ALP tomorrow, watch me eat my words)