I often wonder how frequently innocent newborn babies were dumped in trash incinerators throughout America. Remember, before the 1980's most apartment buildings and housing projects incinerated their garbage on premises. Each floor had a shaft for garbage which was subsequently burned in the basement a couple times a week.
The safe haven laws are a nice idea, but totally unworkable. The only way they can protect a mother who doesn't want to be found, is if it is absolutely prohibited to make any attempt to locate or identify the mother. Which would be fine, except that then you'd get a lot of babies that someone OTHER than the mother doesn't want (like the father who sees 18 years of child support payments looming, or the man who sees a prison term for statutory rape or incest looming), getting dropped off without the mother's consent, and then no one could investigate that possibility.