Lenovo 9443XAU - ThinkPad Z61t 9443 Hardware Maintenance Manual page 97

Note: Applying labels to the base cover
When you replace the base cover, you need to stick some labels on the new
base cover. Some of the labels have been shipped with the new base cover,
and some may need to be reused from the old base cover.
Following labels are the typical labels stuck on the bottom side of the
computer when it is shipped.
a
Windows license label (COA)
b
Product label
c
FCC or homologation label
d
MAC address label
For some models, you also need to apply one or two FCC labels or the other
types of labels. Check the old base cover; if it has one or two FCC labels or
the other types of labels, find duplicates of them in the package and apply
them to the new base cover.
Removing and replacing a FRU
a
b c d
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ThinkPad Z61t