Village Pack 'n Ship at Colony Plaza (closest shipping location to village of St. Charles) allows people to rent mail boxes. They have a very large room to the rear of their store and I know people who rent mail boxes are able to receive packages of all sizes at their business. Here is a link to their store website http://www.villagepacknship.com/contact.html

It wouldn't hurt to give them a call and see they could accomodate your needs.