I just want to clarify that i would not get confrontational with these people as i have learned how to interact with authority through out my life. police and i for example get along great.

I would like to confront them and try to buy the certificate.

Eventually I came to the conclusion that it wasn't worth confronting people about it.

If you are confronted by any legal issue, including one of ethics, consult a local attorney.

@Ryan H I suspected you may have had that conversation with them, whether you decide to have them stay or go I think you are on the right track by laying out the issue and working a solution rather then getting really confrontational.  

I do not want a confrontation with the tenants, although I am willing to do so if necessary.There is one complicating factor.

Address it only if they confront you.  

Post a notice on her door that you will be entering the property and confront her and ask her what's going on.  

It's definitely easier to have someone leave for non confrontational reasons in a month to month (selling, renovating, etc) but from an eviction standpoint there are a lot of variables.

I just want to make quick work of it - not sure if there will be a confrontation...I just want to be in and out and not have to worry about botching the locks in the process.