I don't like preflop. Sure, you're the CO but you're also UTG+1. If you have to open do it with a raise not a limp.

Post flop doesn't look like FPS to me, it looks like a classic semi-bluff followed by a slowplay. Its a good place to check because most people would check quite a few other hands here as well. If you play the same people a lot, this is even better.

Also, I think the button should have raised the flop. His bottom pair + bottom end gutshot SFD isn't the strongest either though so I can see him just taking one off to see what happens but still prefer a raise based on him acting behind you.