its laughably simple to change your ip, and since it happens sometimes even if you dont trigger it, people can use your ip.
to be fair, it would be somewhat rare to randomly get the correct IP
but at the same time, there's a good chance your IP has changed since then
maybe some kind of location matching based on IP to make sure you're in the same area, but that doesn't protect against squabbling between neighbors or whatever
it also would take a fair amount of effort to do