Help me confirm my suspicion re: HVAC filtering

Warranty inspection: there were three fairly large filtered returns in the ceilings of the home. there were also a couple 12x12 unfiltered returns. There was not a filter at the evap coil/furnace in the attic.

True or false: those 12x12 returns should have a filter on them.

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The 12X12 are probably jumper ducts for return air.

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Could you verify in the attic that the 12x12 ductwork connected to the return and not like Roy is thinking? They could, indeed, be jump ducts.

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Thank you! I had a feeling there was something I was missing.

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