The serial number for any Qx hardware can be found on a sticker adhered to the system. The position varies based on model.
Let's use the example of the following serial number, QF3220S10000.
Broken down it looks like this:
Q | F | 32 | 20 | P | 10000
Q = Qumulex
F = Fishers, IN (manufacturing location)
32 = week built
20 = year built
P = Production System
10000 = unique serial identifier