when my mate gave me the tyres they were basically like snakes, moving in the grass (all over the place), they looked new enough but the way he had stored them just apperance liked he’d just scrunched them up and put in a bin bag…
ive never done this, and never had an issue reseating older tyres, i try to fold them over layer up layer (as they come out of the packaging more or less), then use a ziptie to keep them in place….
im fairly positive (without knowing you etc) that the storage has caused your issue too, in the end i just chucked them away…as i say didnt pay for them but id be gutted if i did at 45 quid a pop