To me this looks like somebody opened the box and took the bag out, plain and simple. I really, really doubt any postal worker would put a box in that condition into their truck, much less deliver it.
I have received packages in all kinds of conditions. Sometimes they look like they drive a truck on top of them. USPS is not all that vigilant about it as they could be.
As far as the sellers' personal info, the buyer already has it or can get it with one click off EBay.
p-WA