Items shipped from Amazon.com, including Amazon Warehouse, can be returned within 30 days of delivery, with some exceptions:
Amazon.com doesn’t accept returns of the following items:
For more information visit https://www.amazon.com/gp/help/customer/display.html/?nodeId=GMZNGRA9B5PCJB5F
https://www.amazon.com/gp/help/customer/display.html?nodeId=GKM69DUUYKQWKWX7
While most sellers offer a returns policy equivalent to Amazon’s, some seller returns policies may vary. If the seller’s listing is eligible for Amazon Prime, it will be subject to the same return policies as items fulfilled by Amazon.com that are outlined on this page.
For more information about returning to third-party sellers https://www.amazon.com/gp/help/customer/display.html?nodeId=G38BHJQ25PNCLUBU
Returns are available for nearly everything Walmart sells. Your purchase history on Walmart.com displays the latest eligible date for a return or replacement, however, we recommend keeping track of all manufacturer packaging and your receipt for a minimum of 90 days after purchase.
Items purchased from dealers or resellers and not Walmart or Walmart.com directly aren’t eligible for return, refund, or exchange.
Items sold and shipped by Walmart can be returned or replaced, when available, by mail within 90 days of receipt.
In My eBay, find the item under Purchase history, then in More actions, choose Return this item.
Depending on the seller’s return policy, we may put you in touch with them directly.
You’ll be issued a packing slip and shipping label. Pack the item and ship it.
https://pages.ebay.com/returns/#how_it_works