Did they actually hold $45 million or was it the equivalent in ETH? My understanding at least is it would be hard to turn large amount of ETH into dollars without taking a chunk out of the worth of ETH.
As much as I'd like to take your word on that you'll need to offer something more to actually demonstrate it's true as there is other speculation here it caused a dip and I have no idea which of you is correct.
I get the daily trading volume of ETH itself is large but don't see ready statistics for ETH->USD.