9651 number is the model number of the panel, tamper loop is a connection that should always be closed circuit, even when the alarm is not set, if it goes open circuit, ie if a wire is cut, it alarms, that is a tamper alarm, also passives and panels usually have a small microswitch, usually with a little spring, that gets held switched when the cover is on the item, if you remove cover, the switch opens and again you get a tamper alarm.
Re the bell box, again you probably have it wired wrong, the lid tamper is again, a microswitch in the bell box, so when you open it, you are adding a tamper fault.