Just to clarify something a little here re. "seams"....the speakers cabinets have two different types of seams. Remember that the mdf comes with the vinyl already attached to it, the flat panel is then v-cut almost* through the mdf to the vinyl side per spec, then the whole cut out is 'folded' and glued into a cabinet. So basically you'll end up with a seamless join where the mdf is folded over and then a non seamless join where the next panel joins it. The first two pictures wouldn't concern me, the next two perhaps a little, the last one to me is a bit more of a concern. This is where the mdf was foled over and should be seamless, but it looks like the mdf wasn't quite folded cleanly in that last pick. It's not really a bubble in the vinyl per say although it looks like it. Anyway, I hope you get this resolved...they are excellent sounding surround speakers.
I guess my concerns are that I'm shelling out money for something with flaws. I expect a product to look perfect unless I'm knowingly buying b stock.
I've pretty much decided I will keep the one with the slight mismatch. While there is a risk of the veneer peeling, I'm hoping it wont happen as its going to be hanging on the wall untouched.