By default if you do not order 2.5 ssd/hdd, you are not getting the 2.5 caddies.  Occasionally you get lucky that someone at Dell factory left one free caddy there for you.  but I would not count on that.  these caddies are not cheap either.   If you look up your 8940 service tag, it may specifically mention no hard drive bracket.  that refers to no 2.5 caddy.  
Hi everyone, I just placed an order for a XPS 8940 desktop with 1TB M2.SSD only. Delivery date will be mid-Dec. Does anyone know how many 2.5" caddies are included? I need to install two more 2.5" SSD for additional storage.I chatted with Dell online customer representatives, but some said no caddies are included, some said only one, one said two are included by default, some said didn't know until I provided the service tag number (doesn't make sense, if I can provide the service tag number, I already received the desktop and I can open the case to check if caddies are inside).  As you know, it takes a few weeks before you receive your order.  So, I want to order the 2.5" caddies earlier if they are not included. Thank you!
XPS 8940, how many 2.5" caddies are included?