Retail Fraud or Shoplifting and Statue of Limitaions New York

My question involves criminal law for the state of: New York

A person buys something from a street vendor or other establishment and then exchanges the item in a department store w/o receipt. Gets the same product back not a refund. Is this retail fraud and/or shoplifting and if so what is the statue of limitations for charges. Items value less then 100$ and happened almost 18 months ago.

It sounds like theft by deception. Not sure of the statute of limitations.

Petty Larceny, two year SOL

what about the situation makes it Petit Larceny?