The mercenary activity of the Celts after their 278/9 B.C. explosion into the east and the subsequent movements and migrations afterward certain make it very possible that unrecorded instances of Celtic warbands, settlers, raiding parties, etc... could have made it to the Black Sea without much difficulty, though theres no telling how large or what size these groups could have been. Being on the move could partly explain the lack of overwhelming archeological findings at dig sites; that the Celtic presence was brief; or they were rather a smaller migration and thus assimilated into the surrounding culture(s) before their own culture could really take hold in the region.
Also keep in mind that in the following generations after the 270's B.C. La Tene culture was flowering all over Europe and this was brought eastward through migration, trade, and the transmission of technology introduced by the Celts to others they came in touch with. Mercenary activity directed eastward was at a high point in the following decades as well. Although speaking primarily about the Successor kingdoms, I think that Henri Hubert put it best when he wrote: "
No oriental sovereign was able to do without his contingent of Gauls." Basically true
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