Archaeo-blogger Sam Hardy has analyzed what was found in Abu Sayyaf's stash, but in his rush to promote the group of coins and small antiquities as proof that "highly portable antiquities" are funding ISIS, he misses at least three important points.
First, Hardy makes much of the number of coins (236 by his count) in the group, but is that number really that surprising? Other than pottery shards, coins are the most common artifacts to come down to us from antiquity. So, the fact there are more coins than anything else in the group should not be deemed significant.
Second, the items in the hoard may be portable, but that does not necessarily make them valuable. Indeed, assuming the coins are real-- not fake-- they still would still likely not be worth that much. A quick Internet search suggests that common Islamic gold coins typically retail here in the US for $300-$600 depending on condition. Common Islamic silver sells in the $30-$75 range and bronze even less. Of course, wholesale values, particularly in Syria, Turkey or Lebanon, would likely be far less. As for the antiquities, even if they are real, they certainly don't appear that valuable either. So, what is the hoard worth? CPO would make an educated guess somewhere around $40,000 (retail in the US), but even if it were double or triple that, these numbers still fall far short of what has been speculated and what is needed to fund an insurgency of ISIS' size and scope.
Finally, and perhaps most significantly what may be most interesting about the group is what's missing--there may be Islamic coins with their decorative legends praising Allah, but no Greek, Roman or Byzantine ones with their images of gods, goddesses and rulers. So, where are they? Of course this is just speculation, but perhaps ISIS' iconoclasm and the crucible found with the group provide a clue to an unfortunate fate.
Addendum (Tuesday, July 21): Though little detail is provided, archaeo-blogger Paul Barford notes that the State Department is saying that the group did include some Byzantine and Roman Povincial bronze coins. For whatever reason, no Greek, Roman or Byzantine precious metal coins appear to be in the group. http://eca.state.gov/cultural-heritage-center/iraq-cultural-heritage-initiative/isil-leaders-loot While the State Department also suggests that the material was found with metal detectors, it is more likely in CPO's opinion that it came from local collectors or museums.