The real purpose for the law is to prevent alcohol from being shipped in bulk from out of state for sale in state, but without the appropriate duty tax having been paid for the out of state alcohol.
I would imagine UPS would let it slide and doesn't care, but even if they notified the authoritahs, I think they'd let you slide or would work something out. However, I've never seen anyone charged with shipping alcohol in the mail, so that's a complete guess.