Yes I spoke with the seller. He recommended that I ignore Hertz. I have too many future rentals already booked and have a good deal with them being on the friends and family program. Hertz indicated that it was Millennium Realty vouchers that were being investigated for abuse and since I used 2 of them they wanted to know the source. I do not know if they have any other voucher source companies flagged or not. Not trying to cause anyone problems, just sharing a data point
I do know of one seller here who has sold Millenium Realty vouchers.
Not sure if other sellers have also sold them or how it works with where these vouchers come from.