One of the things that has struck me about the setting is how post- it is: the apocalypse was 50 years ago.
So it's likely the PCs are the children or even grandchildren of survivors. But more than that - 50 years of neglect on the environment, on the man-made structures.
They're not going to find an unlooted supermarket, food rotting in the aisles. The only pre-apoc food around would be canned, dried, spices, salt. No refridgeration.
50 years of no repairs - a library would be a ruin, books pulped.
In many ways, what they need to find if they want random loot is the ruins of the previous generations failures to adapt. That might mean only 10 years neglect - buildings patched and repaired before abandoning to encroaching plague or giant cockroaches.
Of course, the creepiest thing in the world would be coming across something that does look untouched - clean, tidy, not even overgrown...