In this particular case by the time I got involved they had opened the file and who knows what else so the sequence of saving autosave folders, etc was blown. Usually on crashes I find you are more likely to get the autosave recovery dialog when you close out of any other sessions of ArchiCAD you may have had opened at the time.
But back to your point about the autosave folder, in the TW Data folder, under each project is another autosave folder, so where is the autosave data? And more importantly here, he had been saving all day yesterday, so where did that data go. I am assuming somehow he overwrote the local copy with what was on the BIM server which since there had been no S/R killed all the info.
kevin s burns, AIA
massachusetts, usa
AC25 (1413), since AC6
Windows 10
Intel Core i7 -8700 @ 3.2 GHz~ 16 GB ram