In August I traded in an old Galaxy Note 4 and Note 2 at Spark's Queensgate store for my much beloved (and greatly missed) Note 7. One of the staff factory reset both of those phones while I was there as I was unsure how to do it.
You can imagine my surprise when checking my recently used devices in Google that I noticed that the Note 4 was synced to my Google account at the end of October and from Ireland of all places.
To say that I am a little peeved that the sales guy did not do the factory reset as suggested, is correct and very disappointing. But I guess the word of caution here is to ensure that as the phone owner, we are ultimately responsible for the "wipe". If unable to, best to check and confirm that the phone has indeed been correctly factory reset before leaving the store.
At least somebody is happy with my old Note 4 in Ireland. I wonder where the Note 2 ended up?