Once again (...and this is not to indemnify the mfg in any way....) the Form, Fit and Function argument can only fairly be applied to the parameters for which the enclosure was originally designed. It very well may be that they do indeed meet this requirement as it pertains to the telecommunications industry.
In the end, we have to deal with what they supply. However, I have been working on developing a strong business relationship with this manufacturer so that, in the future, I will be able to get prior notice of these types of things. From the moment I first realized we had an issue until the time I had a concrete answer was only a couple of hours. At least they are responsive to our questions!
I am trying to look on the bright side!!!!