Hey, I actually made an account on here only because I saw your question and knew I'd seen this information before, and had to share. You'll find the information on each department's requirements on page 53 of this pdf (typed out as 51 in the document, but labeled as 53 in the search page function). For sculpture, it seems that they account the difficulty of transport and require only photo documentation. Hope this is helpful for you and others!
http://www.yale.edu/printer/bulletin/pdffiles/art.pdf
