Are you sure they are Ethernet sockets ?, if they are , then each Ethernet ‘circuit’ should originate from a common point , and if provided by the developer the common point would be where the ONT was designed to be located, so as to take advantage of them , whereas if they are phone sockets they would simply be ‘daisy chained’ together, it’s the case , for some strange reason , many major developers still provide extension phone sockets on newsites that are FTTP , most that will provide an Ethernet network charge extra for providing one around the building, if you didn’t ask for ( and pay for ) Ethernet, then its not likely to be Ethernet
If you are getting the ONT relocated, then it will be a surface wired from the CSP to the new location of the ONT , obviously this will almost certainly require drilling , cable fixings etc .
The internal copper cables the developer provided are ‘hidden’ because they were installed at first fix ( so behind the finished internal wall finishes ) and will be of no use with an ONT shift , if you wanted to somehow use them to extend the Ethernet connection from the existing ONT position , to the new router location, ( what the developer normally provides Ethernet wiring for ) this obviously isn’t relocating the ONT and the OR tech will not simply change the job from ONT relocation to trying to rewire what the developer provided , for one thing , they won’t have RJ45 socket faceplates to replace the developer provided telephone extension faceplates anyway , that’s making the assumption that the copper cables could be used for Ethernet , which probably isn’t possible anyway.
