When sourcing secondhand luxury wallets, authenticity is the highest priority. You must request high-resolution photos of date codes, serial numbers, and heat stamps. For condition assessment, use the industry-standard grading scale (e.g., S for New Old Stock, SA for Mint, A for Excellent, and B for Gently Used). Pay close attention to edge glazing (cracking), corner wear, and hardware oxidation, as these significantly impact the resale value. Always prioritize suppliers who provide third-party authentication certificates (e.g., Entrupy).