Give them a call. My stamps were sent to an old address this year even though they were sent correctly last year. I called AGFC and they found my current stamp in their return mail. They resent the stamp and had the AMPLEX office reissue the federal stamp. I received both shortly after that.
Me and a buddy got checked Friday at dagmar and the wo asked my buddy were his stamps were and my buddy told him he hasn't recieved them yet, the wo said I'd be checking on them because it's a ticket if there not on the license.There's no way I'd buy another stamp just because of someone's incompetence. As long as you've got the license form showing you bought it, I wouldn't worry about it.