No you cant resell. But which mask you talking about
I don't think they'll let you do that
I doubt it, all sales are final as far as I know, even if you have the receipt
Re-sell? Probably online/garage sale groups. But I dont think they take them in store but you should call and check maybe they'll accept it if it's new?
Call first before you go in person and check
To sell to someone else, I'd think that you could. To return, I'm not sure.
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