Re: There's a good and a bad side to this
In the good old days of the Costa Del Crime, money moved around quite a lot in car roof linings.
You would be amazed at how many second hand British cars were for sale in Spain with the roof ling falling down.
A remark heard frequently some years ago " There's old **&^%(&, every few weeks he comes out for a holiday and he's in a different car!"
Not sure how much would fit in a head lining butI'll bet it's more than a million in mixed notes.
Also as Spain used to be Europe's gateway for drugs into Europe it was cars going to France , Germany and the UK that were searched, not so much for cars coming into Spain ( with much needed currency)