“Egg handler” means a person engaged in the business of producing, candling, grading, packing, or otherwise preparing shell eggs or pasteurized in-shell eggs for market or who engages in the operation of selling or marketing eggs that he or she has produced, purchased, or acquired from a producer, or which he or she is marketing on behalf of a producer, whether as owner, agent, employee, or otherwise. This section shall not apply to any purchaser who is a retailer and who does not handle eggs in any other capacity, except as a retailer.