The coins from this hoard will have a distinctive patina that would not be easy to recreate. Fakes are usually quickly identified by experienced collectors with the seller being added to the ‘Notorious Fake Seller list’ and the forgery being added to an online database. Even so, many people seem to get burned buying fakes online everyday, usually earlier dated silver denarius coins. Bulgaria seems to be the most prolific with the manufacture of fakes.
Reminds me of an old joke:
A tourist was shopping in a street market in a Middle Eastern country. He spied some old Roman coins for sale in a stall. He asked the seller if they were genuine and was quickly assured that they were.
He bought them and went back home where he took them to a coin dealer to have them appraised.
The coin dealer took one look at them and said, “These coins are worthless!”
“Why?” exclaimed the tourist, “Every one of them has the actual date on it!”
“Yes, they do, but the date they are inscribed with is 150 B.C.!”....................