The only case where the seed is stored in the wallet file of a 2fa wallet is if the wallet has been restored from seed and the user chooses to disable 2fa protection at which point it ceases to be a 2fa wallet. But if that's the case it wouldn't prompt the OP for an OTP code when he tried to spend his coins. Yet he says he was prompted for it.
There is a lot of confusion and mis-information in this thread. I have no idea what the OP did either, but there is no way he was asked for a Google Authenticator code from a 2FA wallet that also had the seed in it...
Either he didn't actually have the coins in the 2FA wallet he was trying to use and the wallet he got the seed from was just a "standard" wallet that he found... or he already had a "restored" version of his 2FA wallet and found that copy of the 2FA wallet file in his wallet directory.