Well they do have the chariots in the dbaol and dbm army lists for the late seleucids, and these lists tend to be researched quite well.

Quote Originally Posted by [b
Quote[/b] ]Scythed chariots: 300 are mentioned in a Jewish source at one point, but this seems far too many. At Daphne, before the kingdom was divided, and before the horse-breeding eastern areas had been lost, with the kingdom at peace so that virtually all the available troops were on parade, only 140 were mustered. I therefore think 30 is more likely than 300, and take the absolute maximum number to be half that at Daphne, which would still give 3 elements' worth
DBM
DBAOL

Granius Licinianus also mentiones:
Mithridates had collected many soldiers from all the states, and after learning of the disaster he supplemented them with new levies. 63 He sent out 65,000 foot-soldiers and cavalrymen, and seventy scythed chariots

and in Festus' late 4th-century A.D. Breviarium:
Antiochus, the most powerful king of Syria, waged a formidable war on the Roman people. He had 300,000 armed men, and also drew up a battle line of scythed chariots and elephants

OF course no account is given about the effectiveness, and I do admit that centurys before the greeks had no problems dealing with them (in the Anabasis Xenophon tells us that the Greek Mercenary hoplites just stepped out of the way, letting the chariots drive through their ranks without a casualty)
But I do believe that the chariots might be quite usefull against undiciplined or peasant ropps, and might have been something of a terror weapon against revolting peasants.