Article continues below advertisementThe FBI has received hundreds of new tips after Savannah Guthrie raised the reward for information that leads to her mom's return to $1 million. "More than 750 tips related to Nancy [Guthrie]'s disappearance" have come in since the announcement, NBC News revealed on Wednesday, February 25. Former FBI supervisor Jason Pack told Today's Liz Kreutz that "the family's reward suggests a strategic pivot," as it's been four weeks since the 84-year-old mysteriously vanished.