Sorry for the previous reply, I was looking at the wrong screen. At any rate in regards to your primary questions about traps for physical disconnect. Do the following on the device:
snmp-server enable traps snmp linkup linkdown coldstart
This should notify you when the link is physically disconnected with a linkdown trap and when connected again with a linkup trap.
There is a known bug for older IOS trains that did not generate the linkdown trap when the cable was disconnected. The bug id is CSCsg24215 SNMP linkdown traps not generated in 12.2(33)SRA1.