Missing Box

After we moved we were pretty good at unpacking, but we seem to have a few small things missing. So far, our small plates, our bowls, grandma's mortar, and maybe a few other small kitchen things.

It's probably most efficient to write those off, as the total cost is tiny compared to the total cost of the move. But I'm worried there's something important missing as well we've not realised yet. Or if there's any way it could be the removers fault (despite being exceptionally competent so far), it feels like a waste for them to *have* insurance and yet for us not to claim on it. If I knew for sure what the contents were, I'd be happy to let it go, but if there's a chance some of the things had a little bit of sentimental value (even if only a little) it feels harder to write it off, even if I think I'm chasing a sunk cost.

I checked the old flat afterwards, and didn't find anything left behind.

I asked the removers, and they said they checked the van and didn't find anything left over.

There are four boxes of books from the spare bedroom I need to check, because we haven't got anywhere to put them yet, but it seems really odd the kitchen things would have been muddled in with them and not marked, all the other boxes were labelled very accurately.

I can't imagine how else they could possibly have disappeared. Accidentally unloaded at Liv's parents' house somehow? Accidentally dropped and smashed and discreetly disposed of? Someone left the van unguarded and someone stole a box marked "kitchen misc"? Sitting in the new living room in plain sight and we've been overlooking it all this time? Is there any obvious possibility I've overlooked?

Is there anything I should do? Look through the last boxes? Forget it? Ask the removers again?