Hi Guys,
a work colleague's paypal account was used as a mule to ferry cash. A paypal member would put several donation of money into his account, then after the threshold was reach e.g. $100 the person who hacked his account would then transfer the money to another paypal account. Nothing bad was really done to his account. When he contacted paypal regarding this issue they opened up a investigation for fraud immediately.
I would recommend changing your security details (e.g. passwords) for paypal and associated emails. If it bugs you, you could always contact paypal themselves (they're pretty responsive to these things).