If you're using Creo 3.0, or SolidWorks you can use the files that SolidWorks has provided. I'm not sure if Inventor has the ability to open .stdprt and .stdasm files.
You can download the zip folder by clicking on "NEW! FRC SOLIDWORKS Kit of Parts 2015" over at
http://www.solidworks.com/sw/educati...gn-contest.htm
Once you unzip the folder you'll be able to access YELLOW-TOTE.sldprt, and GRAY-TOTE.sldprt.