Most of the time the Nigerian (or sometimes London) scam letters are somewhat lacking in grammer, spelling & punctuation and are fairly easy to detect. If I have time I play along with them & have quite a collection of phoney cashier's checks and money orders. A few have gotten better and are hard to detect. If I'm not sure I take the check to the bank & let them verify it. Even so I don't ship the item until the check clears. The bogus ones usually arrive in a Fed Ex ot UPS envelope (they don't seem to want to screw with the US Mail). I haven't been stung yet.
Best Regards, George