I think you have to actually go into the UPS store and ship packages through them...

http://images.saleshound.com/smartcircular/retailerpromotionpageimages/officedepot/medium/040516_08Z1DD_pemza.jpg

http://officedepot.crossmediaservices.com/officedepot/circular_browse_listing_detail.asp?storeid=2279500&pagenumber=8&rapid=59181&listingid=-2098146104&mapareaid=1298808&ref=%2Fofficedepot%2Fcircular%5Fbrowse%5Flisting%5 Fdetail%2Easp%3Fstoreid%3D2279500%26pagenumber%3D8 %26rapid%3D59181%26listingid%3D%2D2098146104%26map areaid%3D1298808

**Maximum value of FREE shipment cannot exceed $10.00. Offer not valid on postage stamps or postage services. Offer valid one week only. 5/16/04 through 5/22/04, on all UPS services. Quantities limited. Some products and offers may be available in store only. We reserve the right to limit quantities.

UPS Shipping
Coupon Code 17595274

It just occurred to me that this may only apply to 2 packages total... I'll have to check with my local office depot...

I called my local Office Depot, and they confirmed my fears... the free package is applied once per transaction... therefore you cant go in with 30 packages and ship 15 of them for free all at once in a single transaction... it's still not a bad deal if youre having to ship 2 packages and you wanna save 4-5 bucks...