You do have to refund the buyer.
Buyers have additional rights when they buy online, including the right to return an item within 14 days for any reason.
Some business sellers are allowed to deduct amounts for items which are not returned in the same condition, but with an item like a shaver, how could the buyer comment on the performance without using it?
Ebay Ts and Cs are here:
An item is returned after it was used or damaged by the buyer
If you accepted a buyer's return request but the item is returned in a different condition than it was originally sent:
- You can deduct up to 50% from the refund to recover the lost value of the item. If the buyer had requested the return because the item didn't match the listing, we won't count the return in your "Item not as described" rate in service metrics
- See our guidelines on how much you can deduct
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)