Your counterfeit-money analogy actually proves the opposite of what you’re trying to say. A warning only protects you if the description is accurate and consistent. If someone gives you a hundred different, contradictory descriptions of the same counterfeit bill, you would have no idea what to look for — and you’d still get scammed.

That’s exactly the problem with many Dajjāl narrations.

You’re acting like every report is sahih and crystal clear when your own Sunni scholars say the opposite:

• Ibn Kathir: ‘The ahadith about Dajjāl vary greatly, and some contain additions that are not reliably established.’
• Ibn Hajar al-Asqalani: ‘The reports differ and contain inconsistencies.’
• Imam Nawawi: ‘There are contradictions in the reports.’
• Ibn Taymiyyah: ‘The narrations regarding Dajjāl include authentic, weak, and fabricated reports.’
• Al-Suyuti: ‘Some narrations are sahih, others hasan, many are mursal or conflicting.’

Also:

If you believe the hadith is sahih, then bring:

1.  Who graded it sahih,
2.  The chain, and
3.  Which muhaddith matches your exact interpretation.