Rebate fourms are in green lettering under the price, it's a PDF you have to print out. I hope they're still there...
I've never had any problems with Newegg or Mwave, havn't gone with anyone else because I like them both. You should just be able to contact them and let them know something was missing and they should take care of it.
In The Mail!!!!- Athlon 64 3500 @Stock/Abit K9N SLi sAM2/2GB G.Skill DDR2 800 @Stock /XFX G7900GT XXX 520/1500Mhz/74GB Raptor w/ 16mbcache/300GB 16mbcache SATA HD/NEC DVD-RAM Burner/OCZ ModStream 520watt psu/ThermalTake Armor Jr./Logitech EX110 mouse/keyboard