Box Issue in our Non Production

We have an ongoing issue in the integration between our Salesforce.com App and Box but likely only in our Non Production environment.

Back a few months the Salesforce/Box integration stopped working in our UAT and hotfix environments (non Production). Production working BAU.
Explanation at the time was a bit vague but seems some changes in Test setup that did not happen in production
Since then all efforts seem to be how to make it work and less on root cause or rollback of change.

Timeline

September 20^th We raised issue
September 28^th a call was arranged
September 30^th a potential fix was offered
October 7^th 2^nd follow up call as previous solutions
November 29^th still no further progress

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