This is totally off topic. You should start a new thread. But no it hasn't been detected and isn't likely to be in the foreseeable future.
The smaller a black hole is, the more likely it is and so the stronger the Hawking radiation is. For any black holes we know of the radiation will be pretty much zero.
BTW the description in terms of virtual particle pairs is, as I understand it, just an analogy for what the math actually say. So it can't be taken too literally. Which probably makes most of the remaining questions moot.