Here we go again with the delam issue. Not all have it. Mine is an 06 chasis and has no signs of it and I know of others with no issues. It is absolutely something to check but I sure wouldn't rule out something pre 2010. I've seen H's with glue shot in the sides and a strap around the whole bus like a big xmas bow compressing it to dry. That was a few years ago and I'm sure there doing it differently now.

Later
bv