If a person buys an item from a store for $20, and later on sells it to a collector for 350k...?

if a person purchases an item from a store for $20 and later realises that it is an antique Chinese Ming vase of great value; They on sells it to a Chinese collector for $350,000. The store owner hears about this, and is very angry. Since the value of the vase is so much greater than what it was purchased for, can the store owner demand a share of the money?