A healthcare company I used to work for had a location in CA that, on paper, had 3 circuits - AT&T, Verizon, and Comcast. Each had their own Ciena box in their telecom closet. They were getting a circuit upgraded so one of them was newly installed and we needed to cut over the slowest one to an upgraded one.

Working with the director there, IIRC we traced down the Verizon and Comcast box as actually being connected to the AT&T box. After some checking of circuit IDs on boxes it seemed that the LEC for both the Verizon and Comcast circuits was AT&T, and AT&T was the actual owner of that single physical fiber going out there.

I wish I could sell the same thing 3 times, lol. Contracts were signed on all these circuits so there was no getting out of it.