G6
A few months back I filled out this survey sent by a place I shop at frequently - not uncommon to get one from them either. Fortunately, I did not fill out my full name and a few other details ONLY as it crossed my mind: "They have those details already! And...why would they want my birth date?".
To be on the safe side though I contacted my bank, insurance, phone company, and a few other places like credit agencies in case any criminal activity etc.
I do not usually fill out anything, so from now on will continue that trend.
With Ebay I am sure they send out ALERTS and within EBAY itself as well. I would never respond to an Ebay message via email nor my bank etc. Either it is direct with them on phone (bank) or Ebay itself.
Scammers will try almost anything and phishers etc etc etc.
DND
Yes, they will do almost anything and the worst to keep in mind is online job searches! They know people looking for work will not suspect phishing scams, so they ask for birthdate and last four of you SSN as part of the online "job application".