That doesn't seem to be a code? Are you talking about the cope lintel and I guess 2104.1.1?
*oh that's some 2021 version change. PA is on 2018 and chapter 21 is masonry which got me to the other violation.
You can violate 2021 IBC all you want in PA because it isn't adopted code. 2018 only cares about privacy for urinal partitions and the enclosed stalls which weren't touched.
Almost definitely puffballs, one of my favorite mushrooms to forage. Though I've never had ones this big and I hear they lose a bit of flavor if they're giant.
If you cut a *(vertical) cross section and it's a uniform texture with nothing that looks like the structure of a classic capped mushroom that should rule out any lookalikes. Should still be good if the inside is white and not starting to turn brown.