The Shekel of Tyre was an item that was bought in the Season 6 episode "Shekel and Hyde"
A custumoer walked in with a shekel ot Tyre and presented it to Rick. After the negotiations, Rick ended up buying it for $1,600 and sending it off to be graded.
A few days later, The Shop got a report the the coin was stolen, which angered the Old Man, Corey, and Chumlee. Later on, it was discovered that it could be kept since the owner already collected the insurance money.
The coin came back, graded as an authentic coin, though it did not end the criticism Rick received from his family and Chumlee