I couldn't find but a few of Tills rigs on the kemper factory rigs...but of those he does use the 1960 57 I believe. In his own rigs he just has the cab listed as Marshall 1960 so not sure which one that is.
You don't need to know which one it is, just save the cabinets from his Profiles and re name them...then you know you have his favourite cabs saved with whatever new name you've given them.