Product inspections should at least include a functional test, a functional description, cleaning and professional removal of all personal, identifiable information (PII) in accordance with EU data protection directives such as the GDPR. An intelligent and automated assignment of necessary tests and procedures as well as the step-by-step support of the testers through appropriate solutions can simplify the process and increase the resale value considerably.
A detailed documentation (including photos) of any traces of usage or defects is just as important. The products may not be as good as new, but as long as the next customer has a clear idea of the condition of the product, it will be no problem. Ideally, a partner also has the resources to professionally repair all, or at least particularly important, product segments.