So I am left scratching my head.
You and me both...
The 3 bitcoin are in the address they sent me in their email back in 2017. They say it came from the Trezor One. They say they saw the 3 bitcoin I sent back to them show up in the "Legacy Account" on the Trezor One but that they were greyed out. They were unable to send them any where. Then after they updated the firmware they claim the bitcoins quit showing up in the legacy account even as greyed out ones.
I'm still confused as to how the address and/or balance would show up in the Trezor wallet (greyed out or otherwise) without being able to be to used and/or recreated when the wallet is restored.
Trezor, both the web version and the newer Trezor Suite, does NOT allow you to import addresses or private keys etc. You cannot create a wallet without the device. The web version would essentially recreate the wallet every time you started it up and unlocked your device.
It's certainly not something I've seen while using a Trezor... and I don't recall any similar cases either.