# FLR005-LAB1 — Duplicate and Late Events

Use only the supplied deterministic synthetic fixtures. For each case, build **Event Delivery Anomaly Record v1** from observable evidence.

Keep duplicate detection and late classification separate. Distinguish event identity from business-operation identity. Producer idempotence is bounded to its documented producer/log scope and is not proof of exactly-once external side effects. Preserve `UNKNOWN` when evidence is incomplete.

The transfer fixture changes the ordering key and enables two consumers; do not assume one consumer's local dedupe/order state spans that concurrency boundary.