[tempestn]

I would guess not 100s. The artifacts are priceless in their original form, but most likely in order to sell them they will need to re-cut the stones and melt down the precious metals.

[jsheard]

Unless the artifacts were stolen-to-order for a client who wants them as-is. It happens, paintings get stolen and it's not like those can be melted down.

[russfink]

Or stolen for ransom. That might fetch the largest payout of all.

[2b3a51]

Brokering the deal and arranging the transfer of funds would have a very high risk.

[tasuki]

Yes, stolen-to-order seems like the most plausible explanation.