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The Arverni never traveled to Southeast Europe to my knowledge.
The Boii were further north. They traveled to Pannonia (not to be confused with Paeonia) and fought with the Geto-Dacians. Strabo blamed Burebista (Geto-Dacian king) for the extinction of the Celtic Boii and Taurisci.
Wikipedia says the Baiounitai were a South Slavic tribe and makes no mention of their relation to Celts.
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