Getting PC cards from PSA vault to Europe?

In the next few months, I'm going to have some (let's say 30-50) cards in the PSA vault that I want to ship to Spain, where I now live. The huge issue is the 21% VAT on the insured value, which would cost me at least a couple/few grand, on cards that I have not sold/am not planning to sell.

If you've dealt with this sort of thing, any guidance would be much appreciated!