Those were trials, not regular subscription codes. AFAIK you can only activate one trial per account, and AFAIK your typical PS+ subscription code DOES NOT expire.
Well, to possibly waste 30 bucks on "As far as I know" seems like a gamble. Especially since they will more than likely have this deal again in the future. I'd rather gamble the 10 bucks that they will again, than 30 bucks that they will honor the codes a year+ from now.
"The man in black fled across the desert, and the gunslinger followed"
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