Man. That's a shame. Amp repair (and electronics repair in general) is a dying art. My experience in my area is there's only old timers really know what they're doing and some of them are just stuck in their ways. I've been learning stuff on my own and picking up things from said old timers in my area and they're not afraid to tell you they don't want to work on xyz.
The last time I shipped out an amp (IIC+), I went to Home Depot and grabbed 2 heavy duty moving boxes. I also grabbed some moving blankets from harbor freight. Wrapped the amp in two moving blankets. A folded blanket under, another folded blanket on top. Cut up thick cardboard and stuck it on the sides.. I then took that box, wrapped it with another moving blanket and put it inside the second moving box. It weighed about 70lbs. Overkill? Yeah, but it sure as shit will make it in one piece.