[Arran]

If you can find the original service literature they will have an under chassis parts location diagram that will show you where the original paper caps were located. It looks like this set was serviced sometime in the late 1940s or early 1950s as the majority of caps are now of the Solar Sealtite brand. Oddly enough the Solar Sealtite caps are one of the few paper types that seems to hold up over the years, I've tested many of them on a resistance capacitive bridge and many will pass a leakage test. However I still do not trust them, it's still a good idea to replace with modern polyester film caps.
You are lucky in one way, whoever overhauled this set left the original Philco brand condenser cans in place and simply connected axial lead replacement electrolytics under the chassis. So you can either do the same with model replacements, or open up the cans and stuff new replacements inside for the authentic look.
Regards
Arran