I came across this quite bit accidentally, it's a pattern that's been going on for years. Didn't someone claim the markets are a random walk? I think this proves that to be incorrect.
I haven't really investigated but I doubt whether you can get the quoted rates - as they seem to be a key part of the scam explained in the link, used by the bankster mafia to skim money, in addition to various fees they take in addition of the bid/ask spread (according to the article they skim/rob you atleast 4 different ways). The trick is that when you exchange money they pick a date from now to few days back that gives you the worst possible exchange rate or something along those lines according to the link.