Ok, so block explorer says no matches found to the 28 digit string from 2011. Does that mean it never existed?
Then its likely not anything related to Bitcoin.
Was the community developed enough in 2011 for that to have been a spam attempt? She found an empty folder named the 28 character string.
Your sister might have entered her email somewhere and it got picked up. I really doubt anyone would put their private key or any user info as their folder name. It could be the wallet ID on blockchain.info but its unlikely.
The email from September 2017 is believable that it's spam....
It probably is. Did you click on anything in it?
So strange that she would have that folder there...
How do I check if it's a wallet ID on blockchain.info? I used the import function and that did nothing.
Yes, the email was spam. No official sender or anything.
This is the transaction ID in question if you'd like to triple check if I'm doing something wrong:
c5ef5b8d61b831a02698ac740634
Thank you so much for your time!!!