It seems a coin dealer somewhere attempted to get his or her hands on what he thought was a bulk lot which had entered the trade instead of them being reported to the relevant authorities. They decided to smuggle them out to a foreign buyer through Bulgaria (Sophia Globe, 'Sofia Airport customs officers foil attempt to smuggle out ancient coins in routers', June 12, 2015):
Customs officers at Sofia Airport blocked an attempt to smuggle 82 silver coins believed to date from the time of the fourth century BCE king Philip II of Macedon, the Customs Agency said. [...] The coins were hidden in three routers and were to have been taken from Bulgaria to the United States. Investigations were continuing, the agency said.
|Evidence of conspiracy|
UPDATE 15th June 2015
A coin collector has contacted me to point out the article is incorrect identifying the items seized in the first line as tetradrachms of Philip II of Macedon.
UPDATE UPDATE 16th June 2015
There are now better photos of those coins available here: Ivan Dikov, 'Bulgarian Customs Capture US-Bound Smuggled Treasure of Silver Coins of King Philip II of Macedon', Archaeology in Bulgaria,