Might want to give the rules a read again. You are supposed to immediately change the name and not leave it as the default “Small Vessel (SV)” or the other default names.
Always name each structure something unique immediately…
Even if it is still in construction, you can still name it immediately after placing the starter block.
They may not be able to restore it at all if you didn’t name it like you were supposed to.
Without that they would need the id number.
Unknown if a dev can help you at all, you’ll have to submit a ticket and wait and see.
For reference, this is where the renaming rule is,