I worked for a number of years in an old, drafty steel mill (built around 1900 or so). I never saw a single rat the whole time I was there. But boy, the raccoons. They constantly got into the garbage bins around the mill, and made quite a mess.
It was also a bit - shall we say - startling to go to a bin at 3 AM and see a raccoon staring up at you. In those cases I would choose another bin. He could have that one.
Odd that management never thought to install garbage binds with secure lids.