BTW, you could have some fun with them. The DMCA lays out specific requirements for a notice to an online site such as FR, and it looks like this mail doesn't fulfill the law. Check the
DMCA, down at "ELEMENTS OF NOTIFICATION." Of course ask you lawyer first if you want to play.
Whether worded correctly or not, the intent is clear. They have asked for removal in liu of initiating legal action. Seems like a good idea to comply unless we want to take them on legally.