[Elecraft] Jumper in my K3

[Udo Langenohl - DK5YA]

While installing two new filters in my K3 today I opened the rig for the 
first time (it's quite new, just 4 weeks). After removing the top-cover 
and the bottom cover very carefully a small black 2 pin jumper was 
falling out of the box. I have no idea where it came from. I've read the 
book back and force but still got no idea where this jumper has been 
before, if it ever has been installed.
This is my setup:
K3/10-F  1     K3 10W Xcvr.
KBPF3    1     K3 Gen. Cov. RX Module
KDVR3    1     K3 Dig. Voice Recorder
KRX3-F   1     K3 2nd RX
KTCXO3-1 1     K3 TCXO (1ppm)
KXV3A    1     K3 RX Ant, IF Out & Xvrtr Int

Any idea what to do with this jumper and where it might been before?
The rig ist still working, couldn't find any fault yet.

73 Udo, DK5YA
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