Search for Trifecta Tal Rasha Allegiance in the RMAH. There are only 2 listed, with the EXACT SAME 6 rolls:
Both 5% to lightning dmg (1/12 chance of that)
Both identical int (1/110 chance of that)
Both identical vit (1/91 chance of that)
Both identical crit hit dmg (1/5 chance of that)
Both identical crit hit chance (1/11 chance of that)
Both identical IAS (1/5 chance of that)
So, of ONLY TRIFECTA TAL RASHA AMULETS, the chance of having two identical ones should be:
1/12*1/110*1/91*1/5*1/11*1/5 = .00000003027
This means, OF TRIFECTA ROLLED TAL RASHA'S AMULETS, you would expect to see two identical ones with every 33,036,009 rolled. Who knows what the chance of even rolling a trifecta tal rasha i when you get one (someone has to figure out the chance of rolling IAS + crit chance given any two random properties), but essentially you would expect to see over 33 million trifecta tal amulets on the AH before seeing two identical ones like this.
I'm calling dupe. Blizzard should be banning botters and dupers every day, not this stupid wave approach.