I think this information is not correct. Genuine SanDisk Cruzer Blade memory sticks used to have green circuit boards, but they seem to be black now. (I have both). The fakes are black too. So just looking at the package from the outside will not tell you. Buy from a quality vendor, and check with a linux live disk using the lsusb command from terminal.

lsusb

Bus 009 Device 009: ID 0781:5567 SanDisk Corp. Cruzer Blade
Bus 009 Device 010: ID 0781:5567 SanDisk Corp. Cruzer Blade

I found these Sandisk memory sticks to be very reliable and compatible across a lot of consumer devices, but write speed is unfortunately very slow!