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drcA key with these types of things is that if you are worried or wondering, simply go to eBay, PayPal or your online Bank and change your password. Even if someone stole your password, the old passworld will no longer work and they can no longer access your account. It's recommended to change your passwords on a regular basis anyway, as it makes old passwords inoperative.
If you accidently give someone your password, the scammer often won't access your account for a while-- meaning days, weeks or even months. Some Russian scammer might be trying to deal with hundreds of stolen accounts and doesn't have the time to micromanage each eBay account. This means that even if someone has your password, if you can change the password right away before they do anything bad with your account there's no harm done.