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Do you have any “blank” wall plates/cover plates in your house? On the walls or in the ceiling? If yes, check under those.
Per another comment, a tone generator might help. The “wireless”/probe end of the generator will work through walls of the cables are close to the drywall. It’s still a guessing game, but it might give you some clues.
Post some pics of the RJ11 terminations (take off the wall plate). As long as there are four twisted pairs, there’s a good chance you’ll get gigabit speeds over them.
Can you contact the builder? They might have a low voltage plan and/or remember the approx locations.
