Correct it: use the Simple Past tense: “We did that in 2002.”
Translation: « Est-ce qu’il l’a découpé hier ? »
Why wrong: It’s the first verb (auxiliary) that shows time. Did already indicates past, so the main verb see should be in its simple form (no –s, -ed or –ing endings). To be taken seriously…
Correct it: In Simple tenses (with did, do/does or will), time is already clear, so use the simple form afterwards.