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As an update I think Lego offered to replace all the stolen sets.
Edit yes they have:
https://www.brickfanatics.com/the-lego-group-to-replace-stolen-fairy-bricks-sets/
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What's interesting about this is that all the sets shown are ones that didn't sell very well. Not that the kids on the receiving end would care about that one bit. I still hope they'll find the thieves, and I really would like to know if they'd break them up or try to sell the actual sets. I strongly suspect the former.
https://www.theguardian.com/society/2020/jul/14/charity-founder-left-in-tears-after-theft-of-lego-bricks-for-sick-children
I don't know how the illegal LEGO market works, but as I understand it, it's more lucrative to break sets up and sell them on BrickLink or other marketplace sites, so I imagine that, while it's a lot of work to break up and sort 18,000 sets, there may be little chance these will be recovered. Still, you never know, so perhaps police are able to find a lead before the breaking-up happens.