I would not ship my sear anywhere regardless of the amount of insurance. As someone already mentioned, you can take a SEF semi-pack and with your registered sear, simply add the necessary parts. With a SEF semi auto pack, I'm quite certain you're only "mod" is to knock out the pin (screwdriver and small hammer) that prevents the trigger from going back into the full auto position.
In fact, I believe that was the whole intent of selling these registered sears (unlike factory parts) as they were designed to work with the geometry of the semi-packs - and even better with timed hammers:)
Now getting back to my "no shipping mantra": Can you imagine the process???
*You spend a boatload of $$ on insurance
*Once lost, you then probably have to fight to collect your $30k, or whatever
*Now you need to find another sear that hopefully can be purchased with your claim proceeds
*You start the NFA process all over again
Not me. Luckily, TSC is just down the road, but even with multiple drives or hotel lodging, that is far better than the shipping option.