It varies by area. Here's the guidelines for Portland [0]; it seems that "Home" "FOOD SCRAPS" bins may have pizza boxes in them, as long as wax paper and other inserts are removed. Incidentally, mentally traversing the pizzerias I go to, I think that the only inserts that any of them add are pizza savers [1].

[0] https://www.portland.gov/bps/garbage-recycling/compost-what-...

[1] https://en.wikipedia.org/wiki/Pizza_saver