Great tip. I recently experienced this with an accountant I had been dealing with for a while. One year he sent me an email saying before he could submit my return he needed all sorts of proof of identity documents sent to him and that this was a requirement before he could proceed. I replied asking him what specifically had changed that prevented him from submitting without these documents as he had done in previous years and he just sent a very short email back saying oh don’t worry about it I will just submit everything. Suddenly they were not needed. No further explanation than that.