In case anyone else is looking for this option, here are some hotels that offer the service.

http://www.mandalaybay.com/accommoda...services/bags/
http://www.luxor.com/hotel/hotel_bags_of_nevada.aspx

This article shows 7 total properties that check in bags and get boarding passes for flights at the hotels.
http://www.news.maketraveleasier.com...-vegas-easier/

It's unclear if this information is up to date, but this is from McCarran's website
https://www.mccarran.com/MobileApp/F...eCheck-In.aspx