Group 1 - Costco is tightening its previously lenient return policy, now requiring additional proof of purchase and reviewing customers' return frequency [2] - Some members have reported being asked for more purchase details during returns, with potential refusals if they cannot comply [2] - The tightening of the policy comes in response to increasing instances of return abuse, highlighted by unusual return cases that have gained attention on social media [2] Group 2 - The retail industry is facing significant challenges, with estimated losses of approximately $104 billion in 2024 due to fraudulent returns and claims [3] - Many retailers, including Costco, are tightening return policies to control losses and protect overall member interests [3] - Costco's CEO mentioned that operational inconveniences reported by members are being addressed through digital solutions, aiming to integrate physical and digital platforms [3]