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I have an early 60s plastic Zenith AM/FM clock radio that has a very similar chassis to yours, the main difference is mine has a silicon rectifier and all the coupling capacitors in it are ceramic disc types. I did see the one wax/paper capacitor on the back, so likely there's more inside. Those wax/paper caps should be considered bad at this point and should be replaced.
My Zenith was working as found, despite the original filter caps. It seems like I had to clean the power switch on it once though.
These sets are transformerless and a bit dangerous if you don't know what you're doing, as the chassis can become "hot" if it's plugged in backwards. And if it has a selenium rectifier that should be considered bad too. You might have to get the chassis out of the box to access it though
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