One time I got the box back with one of the h-straps tied in a not because the TSA people couldn't figure out how to snap the buckle Back together. Another time, I saw an inspector trying to force the lid back down on someone's bike box. I left before he got to my box. I didn't want to see what might happen.
With that said, I have never had my bike damaged.
Maybe you will be lucky and your airport will have a full size scanner. When we flew back from Venice in 2013, security ran our bikes through those and literally gave us a "thumbs up." I-T-A! I-T-A!