I agree , it would be bad, but I have to say yes, those installations WOULD be their property. Now the weapons themselves would probably not fall in that category.
BTW. The Confederates sure didn't think that. They sacked every armory in the South. And even before Lincoln's election in November of 1860, Northern armories were being systematically looted under the orders of Sec. of War, Floyd.
Floyd also spent the year before the war began assigning officers who were considered to be secessionist to command Southern forts so they would be turned over without resistance once the secession was declared. He assumed Major Anderson, a slave owner from Kentucky, was in favor of secession when he was assigned to command Sumter. He assumed wrong.
Floyd was a total mole for the Slave Power and spent his time in office activly conspiring to weaken the US Army. Only in December of 1860, after the citizens of Pittsburgh physically blocked a major shipment of large guns and ammo from the Allegheny Arsenal bound to a "Fort" in the South that was only in the planning stages, did Buchanan force Floyd to resign. He promptly accepted a commission in the Confederate Army.
They were conspiring for war and were convinced by their own BS macho rhetoric, that they would easily win because everyone knows that "Yankees can't fight". You still hear a lot of that regional nonsense on these threads. They were amply warned by some of their own including Toombs and Houston that they were getting into a war they could not win.
They were stupid, arrogant, greedy men who caused lots of poor, non slave owning Southern boys to die needlessly.