Personalized items.
Products with extended delivery time.
Items on sale.
Items that are not in original condition and packaging (For example, it came in a sealed box or plastic packaging and this was removed, broken or torn).
Damaged items due to misuse or showing signs of wear and tear, even if they are still under warranty period.
Items that have been assembled, used, altered or installed, unless defective.
Items that were sealed and require their hygienic levels to be intact from the manufacturer.
Further exceptions are mentioned along with the product description.