Used + refurb market, KEH-style grading, 10-Point Sensor Inspection, warranty terms?

Used is a first-class catalog, not a category. Architecture:

• Each used item is a unique SKU, serial-tracked. Magento configurable parent for the body/lens family (e.g. “Sony A7 III, Used”), simple-product children for each individual unit (serial number in the SKU itself).
• Cosmetic grade: Like New (essentially zero use) / Excellent+ (minor signs) / Excellent (visible but not damaged) / Bargain (heavy wear, functional). KEH’s scale; copy it directly, customers know it.
• Functional grade: 24 condition fields covering shutter count (mandatory disclosure), sensor dust, AF responsiveness, weather-seal integrity, screen burn / dead pixels, viewfinder clarity, button wear, dial responsiveness, sensor inspection date.
• 10-Point Sensor Inspection badge for items that passed your in-house QC: hot-pixel test, dust map, sensor scratches, AA filter integrity, IBIS calibration, AF micro-adjustment range, etc.
• Warranty: 6-month default on Like New + Excellent+, 90-day on Excellent, as-is on Bargain. Extension upsell (12 months for $89) at PDP.

Photography workflow: Cloudinary preset with 6 angles + sensor crop + serial-plate close-up. Warehouse photographer follows the preset; uploads auto-attach to the SKU. ~12 minutes per item once trained.

Margin reality: Used camera margin is typically 18-28% (vs 6-12% new). The harder math is days-on-hand (used should turn in <60 days) and shrinkage (~1.5% on body, ~3% on lens from undisclosed defects). Pricing refreshed weekly against MPB + KEH + eBay sold-listings.