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What is this and what insect is it from?

last year

We discovered that wood under our Trex railing was being eaten by some kind of insect. Apparently back in 2012 our HOA had termites but the Orkin man insisted this was not termites (as no tubes were found) . He suspected carpenter ants but we are not convinced that is correct either. It looks like the activity is old and we found these (attached photos). They are approx 1/2" and outer material almost looks like a leaf. Found tons of them.

Any idea what they are?

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