This reminds me of another thread I read on FR years ago where an ancient Roman coin was found inside a Texas Gulf Coast indian burial site.
Btw, Chinese coins have been found on the NW[Washington] coast for years.
Coins:
* Roman coins have been found in Venezuela and Maine.
* Roman coins were found in Texas at the bottom of an Indian mound at Round Rock. The mound is dated at approximately 800 AD.
* In 1957 by a small boy found a coin in a field near Phenix City, Alabama, from Syracuse, on the island of Sicily, and dating from 490 B.C.
* In the town of Heavener, Oklahoma, another out-of-place coin was found in 1976. Experts identified it as a bronze tetradrachm originally struck in Antioch, Syria in 63 A.D. and bearing the profile of the emperor Nero.
* In 1882, a farmer in Cass County, Illinois picked up bronze coin later identified as a coin of Antiochus IV, one of the kings of Syria who reigned from 175 B.C. to 164 B.C., and who is mentioned in the Bible.