[Eggy]

In my opinion the best way to spot a fake is by the messy/ sub standard wiring. If your guys at the shop have had a look at that and given it the all clear then I'm sure it's fine.
It's easy to find a replacement truss cover to swap for the one that's slightly misaligned so don't worry about it. I'd say you were good to go.

Now get out there and Rock !