Syria is an impoverished dictatorship, but they certainly have plenty of resources to cover up an Israeli attack on what they claim was a largely empty warehouse:
"It's a magic act — here today, gone tomorrow," a senior [American] intelligence official said. "It doesn't lower suspicions; it raises them. This was not a long-term decommissioning of a building, which can take a year. It was speedy. It's incredible that they could have gone to that effort to make something go away."
Notice the lack of any international sanctions on Israel for engaging in self-defense. If so, why are Israel's leaders so frightened of the global repercussions if Israel hits Hamas or Iran?