I totally got duped.
I was suspicious about my Shure microphones and I took them to a Shure dealer to look them over. Here is the damage:
$99 sm58- REAL
$140 Beta87- FAKE
I have a Beta 57 ($70) coming and I have a feeling it's a fake too.
I'll never buy microphones from Amazon.com sellers or Ebay again. I'll have to pony up and start paying full price at the local store. Luckily, I should be able to get a full refund for 3 of the 4 fake-o's.
I've learned how to look out for fake Shure mics:
-cheap looking zip pouches/zippers
-included xlr-1/4" cord
-mic stand adapter may not say "manufactured by Shure in Mexico"
-inside of microphone tips are taped
-less wax insulation around transformers
-slightly misshapen windscreens