OLCI (unless it's a mobile key situation) doesn't really check you in. A lot of people don't realize that. You're not formally checked in until you arrive at the property. OLCI just gives a heads up to the hotel that you've done OLCI, they'll check the ressie for any requests, & have the keys made for when you arrive - but they still manually check you in at the front desk even if the keys were pre-made.

Cheers.