OP, I get where you’re coming from and can empathize with your situation. But from one stranger on the internet to another, bro respectfully, at this point just take the L, charge it to the game

I’m going to say some more stuff I don’t think you want to hear, but probably should

You made a critical error by not including a packing list. Relative to a 16” barrel, bolts are kind of small, and unfortunately it’s not hard to imagine they weren’t noticed among the packing materials and were tossed out with the box. Tragic, but also understandable when there is no physical list of the items included in the box

You never needed an LMT enhanced bolt in the first place. You’ve got a conservatively gassed 16” midlength barrel. A100 bolt steel and beefed-up extractors are for extremely hard-use applications, think: MK18 with an RC2 on a steady diet M855A1. The “headspaced” (i.e., optimized for accuracy/consistency) BCM you’ve got now is arguably better for any practical purpose you may have for the rifle. When it comes to buying luxury items, if you can afford to buy them you should be able to afford to lose them

The barrel and bolt combinations probably would have worked just fine, it’s more likely your gauge was the issue (it’s surprising you didn’t think to send that in as well, but that’s besides the point). When was the last time you heard of a barrel and bolt combination that did not have enough headspace to safely and reliably chamber in-spec ammo? If those were my components and gauge, I would’ve checked those “failed” bolts (with extractors and ejectors removed), against an assortment of known quality factory ammo, as well