my oil light flashed on and off. i checked the oil and found it bone dry

answers to the obvious-no leaking ie no oil spots, no smell, no terrible smoke out of the exhaust or anywhere else.
the oil was 2200mi into a 5k synthetic job. so i ask where is the oil if it isn't in the car, on the ground or smoking out? is this going to become a nightmare in that it's leaking somewhere hideously internal and expensive to repair?
the internal leak possibilities are 1) a cracked block into the coolant system for the engine. 2)??? any suggestions? please?