Juniper Networks J4350 - Manual (Page 196)

J4350 and J6350 Services Router Getting Started Guide
J4350 and J6350 Services Routers have two serial number ID labels, one on the
back of the chassis, as shown in Figure 55, and one on the bottom front corner, as
shown in Figure 56.
Figure 55: Location of Serial Number ID Label on Back of Chassis
g003837
176 Locating Component Serial Numbers