[Arran]

 A minor detail though, capacitors used in Canadian radios usually say "Made in Canada" on them, I'm not sure about Philco branded capacitors but some like the Aerovox ones also have a date code. But so long as the graphics look the same, and you have the "Made in USA" part turned upward, nobody will ever know.
  In terms of joining aluminium filter capacitor cans back together, the easiest way is to use aluminium duct or muffler tape to fasten the top back on, I would use that even if it was hidden under a cardboard sleeve since the cardboard can be crushed.
Regards
Arran