A mere moment's work

Rico says it only took a moment to look up Barrister Pedro Antonio Sánchez on the interent, and Raymundo Larraín Nesbitt of Lawbird Legal Services had a post about him back in March of 2009:

Foreigners should be advised that there are many scammers trying to pass themselves off as legitimate Spanish law firms and lawyers. They prey exclusively on foreigners and are, in fact, not Spanish themselves. They are mostly Nigerian (though lately there's been a surge of British and Irish citizens). It is calculated there are over 300,000 Nigerians worldwide scamming people. The golden rule is, they never scam nationals of the country in which they live. So Nigerians located in Spain (Madrid, Málaga, and Granada) scam everyone except the Spanish themselves. Nigerians are among the best educated elite in Africa and their command of English is often superb.
Spanish lawyers belong to one of the Bar Associations throughout Spain. There are a total of 83. Every colleged lawyer has a registered number. It is very easy to check in less than a minute if a Spanish lawyer is legitimate; i.e., registered to practice law in Spain.
Besides, registered lawyers have Professional Indemnity Insurance.
These fraudsters will contact you by a cold-call, e-mail or letter offering you any of the following "services":
1. As the only beneficiary of a Spanish inheritance from some distant (and unknown) relative in Spain that has passed away.
2. Offering to recover resale time share deposits in ongoing court proceedings (Reclaim Certificates). They will offer you "group actions" against timeshare companies through cold-calls. Ask them how they obtained your contact details and the details of your timeshare investment. Remember that legitimate Spanish law firms never cold-call potential clients.
3. Notifying you that you have won the Spanish Lottery (despite never having played it) as a promotion from the generous Lotto Administration.
4. Contacting you regarding using your bank account, in exchange of a commission, for some million-dollar bank transfer with origin in some dodgy place in Africa. This is known as the Nigerian Letter.
5. Offer to assist in verification and payment of unclaimed funds of which you are the beneficiary.
6. Acting as intermediaries for car sales at very reduced prices. They will request you deposit the funds in their lawyer's account.

Rico says 300,000 out of 155 million isn't bad; the US probably has the equivalent...