A Single Coin "Rewrites" German History?

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From stories like this you'd believe that we knew eff-all about our own history until the metal detectors came along to sort it out for us (thedailydigest.com msn, 'A stunning new archaeological discovery could change history' msn 14 Nov 2025)

An ancient Celtic coin that was hidden from the world for more than two thousand years was recently plucked from the Earth by an amateur metal detectorist in Germany. It is a find that has already proven to be one of the best archeological discoveries this year. The metal detectorist was reportedly working her magic in a field near the city of Leipzig when she stumbled across a 2,200-year-old golden coin.

Working her magic, eh? The coin is said to be the type called "regenbogenschüsselchen" rainbow cup coins. It does not look the slightest bit like the ones published in the old literature (Franz Streber 1860, ' Über die sogenannten Regenbogen-Schüsselchen', München). These staters generally have a weight of 6-7g and a diameter of 17-20mm. To me this much smaller coin (2g they say) looks more like (but is not) a fanam coin from the Indian subcontinent - but what do I know? 

Apparently this is soooooo important because: "Celtic coins have been found throughout the Bohemia region and in the northwest Czech Republic. However, modern-day Saxony is far outside what many believe were the settlement areas of Celtic tribes. Only two other Celtic coins have ever been discovered in Saxony, making the discovery of a third a truly interesting find".  Why is it definitely not a modern collector's loss? 

So every time a loose item is found in a field 120km from where other objects that look a bit like it are found, it is a TRULY INTERESTING find? The excited arkies over there think it means their area engaged in "trade" with "The Celts" (an assumption that our ethnicity is determined by what coins we have in our pocket). Was it found in a context buried maybe with scales and weights, imported goods, or maybe grasped in the dead hands of a guy whose strontium isotopes show he was born in Bohemia (or wherever these "Celts" were)? Perhaps German archaeology could leave Kossinnism behind and adopt a more nuanced, questioning and demanding approach to evidence. This coin has "rewritten" nothing.