From a (past)FFL dealer, here is what I would do:

**Remove bolts ship seperate this only helps if the guns get stolen they are out a bolt and now ATF can put a notice to dealers alerting them to persons buying replacement bolt. Ship insured anyway
** Pay a FFL dealer at both ends..it will be next to nothing compared to value of weapons
Ship insured. A FFL dealer will ship to another FFL dealer close to you. You will have
2 responsible individuals "watching out for your interests"