It's only slander if it's not true. If you sent a package to the correct address and it's status is delivered, and the seller keeps the watch something is fishy. Signature or not, I trust the " delivered " more then a signature, since I know I never use my signature since it never turns out well on the machine so I just throw down a big "X". If the watch was delivered to a house and not an apartment building or something odds are the seller has the watch and not some random person.
But as you mentioned being nice and hoping the seller does the right thing is a better idea. I would only use this as a last resort if I had expended all my other options and I was sure the seller got the watch and it was not lost in transit.
Edit: you wouldn't need to explicitly state in feedback that you have been scammed but outline the facts; you got it and sometimes was wrong, sent it back for refund, delivered status but does not acknowledge it and let future buyers think about that, I for one would like to know such information about a seller if factual.
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