Well...
Just got an email from Crystal Burnett aparrently from Sunex with the following message:
Dear Loyal Customer User,
Thanks for being a Sunex fan! Our records indicate that you have received
Several duplicate gift cards in relation to our Mail in Rebate by mistake.
We have removed the funds on the gift cards and they are no longer valid.
Please disregard the duplicate mailing. Again, our apologies for this mistake.
As of now I've only received one rebate card from them, and it was a month ago or so. It kinda feels like a phishing email due to the weird formatting and lack of polish, however I think Sunex is a fairly small operation and that could just be them lacking some big company professionalism. The email came from an email address @visllcusa.com, which when I did a DNS lookup is registered to someone in Traveler's Rest, SC which is where Sunex is HQ'd. It could be that Vis LLC iis either a parent company of Sunex or somehow owned by the same people.
I guess if I suddenly get inundated with hundreds of gift cards in the next few days then it will make sense but for now I'm left quizzled.