Mass might be able to ID what he purchased from within Mass but cannot verify what he still owns.@whacko is correct about the pension. I know that from personal experience.
Much of the rest of any potential advice depends upon some very personal factors of which probably none of us know. Like, what is the actual relationship like right now. Is she angry and vindictive? Or just wanting out of the marriage. Can you guys actually cohabitate without anything exploding?
Don't know how many firearms you have, and don't want to know. Protect at least some of them. Unfortunately the blessed Commonwealth of Massachusetts (sic) probably can/will tell her lawyer how many you have.
Make sure all of HER assets are on the table also. Especially anything expensive you may have purchased for her. It sounds like you paid for her vehicle, make sure that is pointed out also.
Been there, done that. But at least our divorce was somewhat amicable.
I'm leaning to the sacrificial few being on the table- sounds like she's being vindictive and won't settle unless there's a little blood involved. Anything of higher sentimental value should be protected. Some suggestions on that already above.